digibib.net

digibib.net is SSL secured

Free website and domain report on digibib.net

Last Updated: 27th November, 2020 Update Now
Overview

Snoop Summary for digibib.net

This is a free and comprehensive report about digibib.net. Digibib.net has the potential to be earning an estimated $10 USD per day from advertising revenue. If digibib.net was to be sold it would possibly be worth $7,598 USD (based on the daily revenue potential of the website over a 24 month period). Digibib.net receives an estimated 3,647 unique visitors every day - a large amount of traffic! This report was last updated 27th November, 2020.

About digibib.net

Site Preview: digibib.net digibib.net
Title: DigiBib - Digitale Bibliothek
Description: Metasuche in ausgewählten Bibliotheks- und Zeitschriftenkatalogen sowie (Volltext-)Datenbanken weltweit.
Keywords and Tags: education, reference
Related Terms: bibliothek, datenbanken, digitale bibliothek, metasuche, sprachaufenthalte weltweit, volltext suche, weltweit
Fav Icon:
Age: Over 23 years old
Domain Created: 13th October, 2000
Domain Updated:
Domain Expires: 13th October, 2021
Review

Snoop Score

3/5 (Great!)

Valuation

$7,598 USD
Note: All valuation figures are estimates.

Popularity

Modest
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 170,429
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 3,647
Monthly Visitors: 111,003
Yearly Visitors: 1,331,155
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $10 USD
Monthly Revenue: $316 USD
Yearly Revenue: $3,794 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: digibib.net 11
Domain Name: digibib 7
Extension (TLD): net 3
Expiry Check:

Page Speed Analysis

Average Load Time: 1.83 seconds
Load Time Comparison: Faster than 51% of sites

PageSpeed Insights

Avg. (All Categories) 77
Performance 88
Accessibility 97
Best Practices 86
SEO 73
Progressive Web App 41
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
Simulate loading on desktop
88

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for digibib.net. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Time to Interactive — 1.1 s
The time taken for the page to become fully interactive.
Total Blocking Time — 0 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.043
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

First CPU Idle — 1.1 s
The time taken for the page's main thread to be quiet enough to handle input.
Max Potential First Input Delay — 30 ms
Users could experience a delay when interacting with the page.
Estimated Input Latency — 10 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive digibib.net as laggy when the latency is higher than 0.05 seconds.
Network Requests
Below is a list of network requests that were made during page load.
URL Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://digibib.net/
0
493.80000005476
406
0
307
text/html
https://www.digibib.net/
494.2119999323
1206.7229999229
455
0
302
text/html
https://www.digibib.net/Digibib
1207.1299999952
1448.8319999073
7876
37273
200
text/html
Document
https://www.digibib.net/css/digibib.css
1461.9549999479
1922.2770000342
4464
16215
200
text/css
Stylesheet
https://www.digibib.net/EXTERN/css/location.css
1462.1349999215
2020.1369998977
2652
11467
200
text/css
Stylesheet
https://www.digibib.net/js/jquery-3.5.1/jquery.min.js
1462.259999942
2153.8579999469
31406
89476
200
application/javascript
Script
https://www.digibib.net/js/d6-1.1/genlogin.js
1462.5530000776
1926.8209999427
18774
94674
200
application/javascript
Script
https://www.digibib.net/EXTERN/js/location.js
1462.8749999683
1575.6180000026
442
0
200
application/javascript
Script
https://www.digibib.net/EXTERN/img/logo.gif
2274.8380000703
2387.2100000735
4600
4165
200
image/gif
Image
https://www.digibib.net/img/flag-switch-de.png
2388.0539999809
2500.8409998845
1032
599
200
image/png
Image
https://www.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
2160.3289998602
2273.4920000657
7023
19837
200
application/javascript
Script
https://www.digibib.net/css/print.css
2389.2669999041
2502.7689998969
1491
2929
200
text/css
Stylesheet
https://www.digibib.net/css/cookieconsent-3.0.6/cookieconsent.min.css
1924.0749999881
2386.800999986
1671
3952
200
text/css
Stylesheet
https://www.digibib.net/css/yaml/core/slim_base.css
1924.1929999553
2039.3059998751
1550
2394
200
text/css
Stylesheet
https://www.digibib.net/css/yaml/screen/forms.css
1924.8160000425
2038.7450000271
2810
7654
200
text/css
Stylesheet
https://www.digibib.net/css/digibib_vlist.css
1925.0570000149
2039.6279999986
1266
2244
200
text/css
Stylesheet
https://www.digibib.net/img/dialog-information.png
2426.1369998567
2538.5489999317
2355
1921
200
image/png
Image
https://www.digibib.net/EXTERN/css/Noto_Sans_700.woff2
2432.976000011
2655.6760000531
16155
15676
200
application/octet-stream
Font
https://www.digibib.net/EXTERN/css/Noto_Sans_400.woff2
2433.6429999676
2701.1229998898
16095
15616
200
application/octet-stream
Font
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
1477.875
7.778
2416.107
33.563
2449.683
39.733
2495.68
22.919
2685.147
12.664
2728.324
28.53
2762.312
6.185
2785.517
5.632
3101.432
5.036
3288.83
5.059
3319.159
5.416
3346.555
5.269
3386.071
5.022
3520.356
5.446
3597.503
5.11
3617.5
5.121
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Digibib.net should consider serving more appropriate-sized images.
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Digibib.net should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Digibib.net should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Digibib.net should consider minifying JS files.
Remove unused CSS
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Digibib.net should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
Remove unused JavaScript
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 240 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.digibib.net/Digibib
242.7
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Digibib.net should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.

Diagnostics

Avoids enormous network payloads — Total size was 120 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://www.digibib.net/js/jquery-3.5.1/jquery.min.js
31406
https://www.digibib.net/js/d6-1.1/genlogin.js
18774
https://www.digibib.net/EXTERN/css/Noto_Sans_700.woff2
16155
https://www.digibib.net/EXTERN/css/Noto_Sans_400.woff2
16095
https://www.digibib.net/Digibib
7876
https://www.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
7023
https://www.digibib.net/EXTERN/img/logo.gif
4600
https://www.digibib.net/css/digibib.css
4464
https://www.digibib.net/css/yaml/screen/forms.css
2810
https://www.digibib.net/EXTERN/css/location.css
2652
Avoids an excessive DOM size — 626 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
626
Maximum DOM Depth
19
Maximum Child Elements
279
Avoid chaining critical requests — 10 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Digibib.net should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.0 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.digibib.net/Digibib
305.25
7.667
1.153
Minimizes main-thread work — 0.4 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Rendering
180.37
Style & Layout
91.893
Other
65.298
Script Evaluation
46.908
Parse HTML & CSS
15.554
Script Parsing & Compilation
6.4
Keep request counts low and transfer sizes small — 19 requests • 120 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
19
122523
Script
4
57645
Font
2
32250
Stylesheet
7
15904
Image
3
7987
Document
1
7876
Other
2
861
Media
0
0
Third-party
0
0
Minimize third-party usage
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

First Contentful Paint — 1.0 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 2.3 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 1.3 s
The timing of the largest text or image that is painted.

Other

First Meaningful Paint — 1.1 s
The time taken for the primary content of the page to be rendered.

Opportunities

Eliminate render-blocking resources — Potential savings of 650 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Digibib.net should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://www.digibib.net/css/digibib.css
4464
70
https://www.digibib.net/EXTERN/css/location.css
2652
150
https://www.digibib.net/js/jquery-3.5.1/jquery.min.js
31406
270
https://www.digibib.net/js/d6-1.1/genlogin.js
18774
230
https://www.digibib.net/EXTERN/js/location.js
442
150
Avoid multiple page redirects — Potential savings of 420 ms
Redirects can cause additional delays before the page can begin loading. Digibib.net should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://digibib.net/
190
https://www.digibib.net/
230
https://www.digibib.net/Digibib
0

Diagnostics

Serve static assets with an efficient cache policy — 16 resources found
Digibib.net can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://www.digibib.net/js/jquery-3.5.1/jquery.min.js
0
31406
https://www.digibib.net/js/d6-1.1/genlogin.js
0
18774
https://www.digibib.net/EXTERN/css/Noto_Sans_700.woff2
0
16155
https://www.digibib.net/EXTERN/css/Noto_Sans_400.woff2
0
16095
https://www.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
0
7023
https://www.digibib.net/EXTERN/img/logo.gif
0
4600
https://www.digibib.net/css/digibib.css
0
4464
https://www.digibib.net/css/yaml/screen/forms.css
0
2810
https://www.digibib.net/EXTERN/css/location.css
0
2652
https://www.digibib.net/img/dialog-information.png
0
2355
https://www.digibib.net/css/cookieconsent-3.0.6/cookieconsent.min.css
0
1671
https://www.digibib.net/css/yaml/core/slim_base.css
0
1550
https://www.digibib.net/css/print.css
0
1491
https://www.digibib.net/css/digibib_vlist.css
0
1266
https://www.digibib.net/img/flag-switch-de.png
0
1032
https://www.digibib.net/EXTERN/js/location.js
0
442

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://www.digibib.net/EXTERN/css/Noto_Sans_700.woff2
222.7000000421
https://www.digibib.net/EXTERN/css/Noto_Sans_400.woff2
267.47999992222
97

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of digibib.net. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Digibib.net may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Digibib.net may provide relevant information that dialogue cannot, by using audio descriptions.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements

Navigation

Heading elements are not in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
86

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that digibib.net should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.5.1
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://digibib.net/

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
73

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for digibib.net. This includes optimizations such as providing meta data.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Mobile Friendly

Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of digibib.net on mobile screens.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.

Crawling and Indexing

Page is blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
Blocking Directive Source

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
41

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of digibib.net. This includes details about web app manifests.

Fast and reliable

Page load is fast enough on mobile networks
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

Fast and reliable

Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://digibib.net/
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of digibib.net on mobile screens.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 75
Performance 59
Accessibility 97
Best Practices 86
SEO 85
Progressive Web App 50
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
Simulate loading on mobile
59

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for digibib.net. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Total Blocking Time — 80 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

Max Potential First Input Delay — 110 ms
Users could experience a delay when interacting with the page.
Estimated Input Latency — 10 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive digibib.net as laggy when the latency is higher than 0.05 seconds.
Network Requests
Below is a list of network requests that were made during page load.
URL Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://digibib.net/
0
226.33199999109
406
0
307
text/html
https://www.digibib.net/
227.07099991385
694.71399998292
446
0
302
text/html
https://m.digibib.net/
695.29799988959
1279.9139999552
453
0
302
text/html
https://m.digibib.net/Digibib
1280.4189999588
1871.8119999394
8187
38024
200
text/html
Document
https://m.digibib.net/css/digibib.css
1891.2259999197
2146.8089999398
4463
16215
200
text/css
Stylesheet
https://m.digibib.net/EXTERN/css/location.css
1891.558000003
2006.801999989
2651
11467
200
text/css
Stylesheet
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
1891.8139999732
2723.5559999244
31406
89476
200
application/javascript
Script
https://m.digibib.net/js/d6-1.1/genlogin.js
1892.1629999531
2605.6399999652
18774
94674
200
application/javascript
Script
https://m.digibib.net/css/mobile.css
1892.6339999307
2696.5799999889
1531
5182
200
text/css
Stylesheet
https://m.digibib.net/js/jquery.mobileselect.js
1893.102999893
2351.8789999653
1828
3510
200
application/javascript
Script
https://m.digibib.net/EXTERN/js/location.js
1893.3629998937
2352.5669999653
443
0
200
application/javascript
Script
https://m.digibib.net/EXTERN/img/logo.gif
2730.850999942
2844.1049999092
4600
4165
200
image/gif
Image
https://m.digibib.net/img/flag-switch-de.png
2774.5749999303
2901.3979999581
1032
599
200
image/png
Image
https://m.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
2697.7819999447
3159.4869999681
7024
19837
200
application/javascript
Script
https://m.digibib.net/css/print.css
2774.7479999671
2888.6089998996
1491
2929
200
text/css
Stylesheet
https://m.digibib.net/css/cookieconsent-3.0.6/cookieconsent.min.css
2148.5399999656
2506.2639999669
1670
3952
200
text/css
Stylesheet
https://m.digibib.net/css/yaml/core/slim_base.css
2148.6699999077
2612.623999943
1551
2394
200
text/css
Stylesheet
https://m.digibib.net/css/yaml/screen/forms.css
2148.8239999162
2262.9169999855
2810
7654
200
text/css
Stylesheet
https://m.digibib.net/css/digibib_vlist.css
2149.0419999463
2262.3389998917
1266
2244
200
text/css
Stylesheet
https://m.digibib.net/img/dialog-information.png
2788.2689998951
2902.2779999068
2355
1921
200
image/png
Image
https://m.digibib.net/EXTERN/css/Noto_Sans_400.woff2
2802.9819999356
3026.2219998986
16095
15616
200
application/octet-stream
Font
https://m.digibib.net/EXTERN/css/Noto_Sans_700.woff2
2803.8379999343
3271.1499999277
16156
15676
200
application/octet-stream
Font
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
1901.778
9.002
1916.349
5.284
2757.339
48.99
2806.348
88.896
3058.011
18.111
3192.105
27.577
3298.181
24.896
3323.147
6.216
3351.528
5.229
3385.331
5.997
3418.3
5.921
3434.803
5.545
3451.619
5.014
3468.049
6.181
3485.023
5.551
3501.411
5.629
3518.182
5.205
3534.717
5.619
3551.452
5.49
3601.246
5.847
3617.987
5.186
3884.775
6.488
3901.469
6.166
3918.292
7.142
3934.791
5.402
3951.358
6.056
3968.01
6.757
3984.604
5.356
4068.329
5.336
4084.634
5.886
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Digibib.net should consider serving more appropriate-sized images.
Defer offscreen images — Potential savings of 4 KiB
Time to Interactive can be slowed down by resources on the page. Digibib.net should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://m.digibib.net/EXTERN/img/logo.gif
4165
4165
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Digibib.net should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Digibib.net should consider minifying JS files.
Remove unused CSS
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Digibib.net should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
Remove unused JavaScript
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 590 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://m.digibib.net/Digibib
592.391
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Digibib.net should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.

Diagnostics

Avoids enormous network payloads — Total size was 124 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
31406
https://m.digibib.net/js/d6-1.1/genlogin.js
18774
https://m.digibib.net/EXTERN/css/Noto_Sans_700.woff2
16156
https://m.digibib.net/EXTERN/css/Noto_Sans_400.woff2
16095
https://m.digibib.net/Digibib
8187
https://m.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
7024
https://m.digibib.net/EXTERN/img/logo.gif
4600
https://m.digibib.net/css/digibib.css
4463
https://m.digibib.net/css/yaml/screen/forms.css
2810
https://m.digibib.net/EXTERN/css/location.css
2651
Avoids an excessive DOM size — 631 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
631
Maximum DOM Depth
19
Maximum Child Elements
279
Avoid chaining critical requests — 12 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Digibib.net should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.2 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://m.digibib.net/Digibib
1711.172
40.232
4.604
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
240.628
168
6.196
Unattributable
136.26
8.036
0.684
https://m.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
80.692
6.036
5.34
Keep request counts low and transfer sizes small — 22 requests • 124 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
22
126638
Script
5
59475
Font
2
32251
Stylesheet
8
17433
Document
1
8187
Image
3
7987
Other
3
1305
Media
0
0
Third-party
0
0
Minimize third-party usage
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 4 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
3780
196
https://m.digibib.net/Digibib
2391
178
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
5550
55
https://m.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
5605
50
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

Time to Interactive — 4.7 s
The time taken for the page to become fully interactive.

Other

First CPU Idle — 4.2 s
The time taken for the page's main thread to be quiet enough to handle input.

Diagnostics

Serve static assets with an efficient cache policy — 18 resources found
Digibib.net can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
0
31406
https://m.digibib.net/js/d6-1.1/genlogin.js
0
18774
https://m.digibib.net/EXTERN/css/Noto_Sans_700.woff2
0
16156
https://m.digibib.net/EXTERN/css/Noto_Sans_400.woff2
0
16095
https://m.digibib.net/js/cookieconsent-3.0.6/cookieconsent.min.js
0
7024
https://m.digibib.net/EXTERN/img/logo.gif
0
4600
https://m.digibib.net/css/digibib.css
0
4463
https://m.digibib.net/css/yaml/screen/forms.css
0
2810
https://m.digibib.net/EXTERN/css/location.css
0
2651
https://m.digibib.net/img/dialog-information.png
0
2355
https://m.digibib.net/js/jquery.mobileselect.js
0
1828
https://m.digibib.net/css/cookieconsent-3.0.6/cookieconsent.min.css
0
1670
https://m.digibib.net/css/yaml/core/slim_base.css
0
1551
https://m.digibib.net/css/mobile.css
0
1531
https://m.digibib.net/css/print.css
0
1491
https://m.digibib.net/css/digibib_vlist.css
0
1266
https://m.digibib.net/img/flag-switch-de.png
0
1032
https://m.digibib.net/EXTERN/js/location.js
0
443
Minimize main-thread work — 2.2 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Rendering
938.76
Style & Layout
551.992
Other
385.232
Script Evaluation
255.744
Parse HTML & CSS
92.096
Script Parsing & Compilation
24.444

Metrics

First Contentful Paint — 4.1 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 7.3 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 4.7 s
The timing of the largest text or image that is painted.
Cumulative Layout Shift — 0.325
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

First Meaningful Paint — 4.2 s
The time taken for the primary content of the page to be rendered.
First Contentful Paint (3G) — 7748 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Eliminate render-blocking resources — Potential savings of 1,930 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Digibib.net should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://m.digibib.net/css/digibib.css
4463
330
https://m.digibib.net/EXTERN/css/location.css
2651
480
https://m.digibib.net/js/jquery-3.5.1/jquery.min.js
31406
1080
https://m.digibib.net/js/d6-1.1/genlogin.js
18774
930
https://m.digibib.net/css/mobile.css
1531
480
https://m.digibib.net/js/jquery.mobileselect.js
1828
480
https://m.digibib.net/EXTERN/js/location.js
443
180
Avoid multiple page redirects — Potential savings of 2,190 ms
Redirects can cause additional delays before the page can begin loading. Digibib.net should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://digibib.net/
630
https://www.digibib.net/
780
https://m.digibib.net/
780
https://m.digibib.net/Digibib
0

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://m.digibib.net/EXTERN/css/Noto_Sans_400.woff2
223.23999996297
https://m.digibib.net/EXTERN/css/Noto_Sans_700.woff2
467.3119999934
97

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of digibib.net. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Digibib.net may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Digibib.net may provide relevant information that dialogue cannot, by using audio descriptions.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements

Navigation

Heading elements are not in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
86

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that digibib.net should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.5.1
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://digibib.net/

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
85

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for digibib.net. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of digibib.net on mobile screens.
Document uses legible font sizes — 92.43% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
html *
4.06%
10.7563px
3.51%
8.06642px
0.00%
10.7563px
92.43%
≥ 12px
Tap targets are sized appropriately — 100% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.

Crawling and Indexing

Page is blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
Blocking Directive Source

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
50

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of digibib.net. This includes details about web app manifests.

Fast and reliable

Page load is fast enough on mobile networks
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of digibib.net on mobile screens.
Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

Fast and reliable

Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://digibib.net/
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 193.30.112.252
Continent:
Country:
Region:
City:
Longitude:
Latitude:
Currencies:
Languages:

Web Hosting Provider

Registration

Domain Registrant

Private Registration: No
Name:
Organization:
Country:
City:
State:
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Name IP Address
COREhub, S.R.L. 178.238.230.17
Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating: 3.5/5 (0 reviews)
WOT Trustworthiness: 70/100
WOT Child Safety: 97/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: www.digibib.net
Issued By: DFN-Verein Global Issuing CA
Valid From: 17th August, 2020
Valid To: 19th November, 2022
Subject: CN = www.digibib.net
O = Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen
L = Koeln
S = DE
Hash: 6450e18e
Issuer: CN = DFN-Verein Global Issuing CA
OU = DFN-PKI
O = Verein zur Foerderung eines Deutschen Forschungsnetzes e. V.
S = DE
Version: 2
Serial Number: 10940486251711449660052990562
Serial Number (Hex): 2359C2141B90166845D3EA62
Valid From: 17th August, 2024
Valid To: 19th November, 2024
Signature Algorithm (Short Name): RSA-SHA256
Signature Algorithm (Long Name): sha256WithRSAEncryption
Authority Key Identifier: keyid:6B:3A:98:8B:F9:F2:53:89:DA:E0:AD:B2:32:1E:09:1F:E8:AA:3B:74
Extended Key Usage: TLS Web Server Authentication
CRL Distribution Points:
Full Name:
URI:http://cdp1.pca.dfn.de/dfn-ca-global-g2/pub/crl/cacrl.crl

Full Name:
URI:http://cdp2.pca.dfn.de/dfn-ca-global-g2/pub/crl/cacrl.crl

Certificate Policies: Policy: 2.23.140.1.2.2
Policy: 1.3.6.1.4.1.22177.300.30
Policy: 1.3.6.1.4.1.22177.300.1.1.4
Policy: 1.3.6.1.4.1.22177.300.1.1.4.7
Policy: 1.3.6.1.4.1.22177.300.2.1.4.7

Authority Information Access: OCSP - URI:http://ocsp.pca.dfn.de/OCSP-Server/OCSP
CA Issuers - URI:http://cdp1.pca.dfn.de/dfn-ca-global-g2/pub/cacert/cacert.crt
CA Issuers - URI:http://cdp2.pca.dfn.de/dfn-ca-global-g2/pub/cacert/cacert.crt

SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 46:A5:55:EB:75:FA:91:20:30:B5:A2:89:69:F4:F3:7D:
11:2C:41:74:BE:FD:49:B8:85:AB:F2:FC:70:FE:6D:47
Timestamp : Aug 17 08:49:13.007 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:44:02:20:4F:70:68:09:7A:A2:9E:9C:C8:CA:E0:A0:
18:D9:1D:17:0C:44:17:90:59:5A:70:CB:A9:A8:30:E9:
84:1A:D1:EC:02:20:64:52:8D:6D:F5:55:F6:62:80:4F:
20:76:B1:9C:F2:44:B7:38:9E:E8:A2:CD:55:D5:43:74:
42:73:41:05:DC:2B
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 29:79:BE:F0:9E:39:39:21:F0:56:73:9F:63:A5:77:E5:
BE:57:7D:9C:60:0A:F8:F9:4D:5D:26:5C:25:5D:C7:84
Timestamp : Aug 17 08:49:14.394 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:21:00:EC:45:DA:D5:B7:30:73:4C:BB:E6:2E:
29:C5:4F:8F:E6:F6:B9:E7:E9:D7:7C:4F:07:02:CE:43:
FA:CE:E9:85:62:02:20:10:DB:55:DA:32:39:2E:8C:E8:
73:80:3A:02:FE:88:AC:C3:7B:34:FA:19:27:3C:C7:87:
A8:FE:89:DC:53:9D:A5
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 6F:53:76:AC:31:F0:31:19:D8:99:00:A4:51:15:FF:77:
15:1C:11:D9:02:C1:00:29:06:8D:B2:08:9A:37:D9:13
Timestamp : Aug 17 08:49:13.509 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:46:10:C4:40:AA:F5:BA:71:18:22:74:D0:
95:D8:C2:3B:37:20:F5:6F:61:34:07:9A:43:CA:C2:20:
9E:A1:5C:AB:02:21:00:99:EB:C1:20:CA:33:31:B0:BB:
2A:3B:5F:16:CD:E5:E7:6E:91:D0:FC:61:DC:16:66:B7:
76:C7:32:8F:BC:47:3C
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 55:81:D4:C2:16:90:36:01:4A:EA:0B:9B:57:3C:53:F0:
C0:E4:38:78:70:25:08:17:2F:A3:AA:1D:07:13:D3:0C
Timestamp : Aug 17 08:49:13.782 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:41:D1:15:FA:FE:AD:B9:9C:70:0A:EA:DB:
18:A8:C0:48:37:D2:D3:AD:70:E5:D4:0F:60:E1:40:24:
35:F0:6E:60:02:21:00:E7:59:8A:B4:83:00:E9:C5:77:
EE:A7:14:D4:7A:8A:CC:93:63:65:F4:3A:53:0E:FE:68:
F2:94:1C:47:BE:94:7B
Key Usage: Digital Signature, Key Encipherment
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:*.digibib.net
DNS:*.stage.digibib.net
DNS:devel.digibib.net
DNS:digibib.net
DNS:stage.digibib.net
DNS:www.digibib.net
DNS:*.devel.digibib.net
Technical

DNS Lookup

A Records

Host IP Address Class TTL
digibib.net. 193.30.112.252 IN 21599

NS Records

Host Nameserver Class TTL
digibib.net. nse03.hbz-nrw.de. IN 21599
digibib.net. nse04.hbz-nrw.de. IN 21599
digibib.net. noc2.rrz.Uni-Koeln.de. IN 21599

CAA Records

Domain Flags Tag Class TTL
mailto:pki@hbz-nrw.de 0 iodef IN 21599
pki.dfn.de 0 issuewild IN 21599
pki.dfn.de 0 issue IN 21599

SOA Records

Domain Name Primary NS Responsible Email TTL
digibib.net. ns00.hbz-nrw.de. unix.hbz-nrw.de. 21599

HTTP Response Headers

HTTP-Code: HTTP/1.1 200 OK
Date: 27th November, 2020
Server: Apache/2.4.23
Expires: 1st April, 2024
Cache-Control: no-store
Content-Type: text/html; charset=UTF-8
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=15768000
Vary: User-Agent,Accept-Encoding
Last-Modified: 27th November, 2020
Pragma: no-cache

Whois Lookup

Created: 13th October, 2000
Changed:
Expires: 13th October, 2021
Registrar: COREhub, S.R.L.
Status: ok
Nameservers: noc2.rrz.uni-koeln.de
nse03.hbz-nrw.de
nse04.hbz-nrw.de
Owner Organization: Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen
Owner Country: DE
Owner Email: https://corehub.net/whoiscontact/
Admin Email: https://corehub.net/whoiscontact/
Tech Email: https://corehub.net/whoiscontact/
Billing Email: https://corehub.net/whoiscontact/
Full Whois: Domain Name: digibib.net
Registry Domain ID: D10421710-CONE
Registrar WHOIS Server: whois.corehub.net
Registrar URL: http://corehub.net
Updated Date:
Creation Date: 2000-10-13T10:22:37.0Z
Registrar Registration Expiration Date: 2021-10-13T10:22:37.0Z
Registrar: COREhub, S.R.L.
Registrar IANA ID: 15
Registrar Abuse Contact Email: abuse@corehub.net
Registrar Abuse Contact Phone: +34.931807144
Reseller: CORE-132 (DFN Verein)
Domain Status: ok https://icann.org/epp#ok
Registry Registrant ID:
Registrant Name:
Registrant Organization: Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen
Registrant Street:
Registrant City:
Registrant State/Province:
Registrant Postal Code:
Registrant Country: DE
Registrant Phone:
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: https://corehub.net/whoiscontact/
Registry Admin ID:
Admin Name:
Admin Organization:
Admin Street:
Admin City:
Admin State/Province:
Admin Postal Code:
Admin Country:
Admin Phone:
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: https://corehub.net/whoiscontact/
Registry Tech ID:
Tech Name:
Tech Organization:
Tech Street:
Tech City:
Tech State/Province:
Tech Postal Code:
Tech Country:
Tech Phone:
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: https://corehub.net/whoiscontact/
Registry Tech 2 ID:
Tech 2 Name:
Tech 2 Organization:
Tech 2 Street:
Tech 2 City:
Tech 2 State/Province:
Tech 2 Postal Code:
Tech 2 Country:
Tech 2 Phone:
Tech 2 Phone Ext:
Tech 2 Fax:
Tech 2 Fax Ext:
Tech 2 Email: https://corehub.net/whoiscontact/
Registry Billing ID:
Billing Name:
Billing Organization:
Billing Street:
Billing City:
Billing State/Province:
Billing Postal Code:
Billing Country:
Billing Phone:
Billing Phone Ext:
Billing Fax:
Billing Fax Ext:
Billing Email: https://corehub.net/whoiscontact/
Name Server: nse04.hbz-nrw.de
Name Server: nse03.hbz-nrw.de
Name Server: noc2.rrz.uni-koeln.de
DNSSEC: unsigned
IDN Tag:
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of Whois database: 2020-11-27T09:54:41.246Z <<<

For more information on Whois status codes, please visit https://icann.org/epp

(c) COREhub S.R.L.U. ("COREhub"). All rights reserved.

NOTICE: Access to the domain name's information is restricted in
order to protect the privacy of Registrants. If you believe you
have a legitimate interest in having access to part or all of the
data not published in the above output, please contact the
Registrar of record at the address shown in the output above OR
complete the form at:

https://corehub.net/whoisaccess/

The compilation, repackaging, dissemination or other use of the data
in the COREhub Whois database is expressly prohibited without the
prior written consent of COREhub. COREhub reserves the right to
restrict your access to the Whois database in its sole discretion to
ensure operational stability. COREhub may restrict or terminate your
access to the Whois database for failure to abide by these terms of
use. COREhub reserves the right to modify these terms at any time.

End of Whois record.

Nameservers

Name IP Address
noc2.rrz.uni-koeln.de 134.95.129.23
nse03.hbz-nrw.de 193.30.112.3
nse04.hbz-nrw.de 193.30.112.4
Related

Subdomains

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