A11y.css provides warnings about possible risks and mistakes that exist in HTML.

Latest Version

Version
2.0.2
Update
November 6, 2024
Size
611KiB
Developer
Category
Users
2,000+
Rating
3.75 ★
Manifest Version
3
Web Store Status
Languages Support
English
Français
Español
Polski
Ελληνικά
русский
See more
Permissions
ActiveTab
Tabs
Storage
Scripting
See more

a11y.css Extension

First a11y.css was a bookmarklet inserting a stylesheet into the page.

This CSS file intends to warn developers about possible risks and mistakes that exist in HTML code. It can also be used to roughly evaluate a site's quality by simply including it as an external stylesheet.


This extension does the same, plus adds some tools:

— Outline focus (keyboard navigation)
— Show languages used (relies on lang attributes)
—Check alt and title attributes on images


You can submit your bugs on github.

Original bookmarklet code: Gaël Poupard
Extension code: Stéphane Deschamps
Thanks to Anthony Ricaud and Mathieu Pillard for their help!
Read more

Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "a11y.css", "description": "a11y.css provides warnings about possible risks and mistakes that exist in HTML.", "version": "2.0.2", "default_locale": "en", "minimum_chrome_version": "93", "permissions": [ "activeTab", "tabs", "storage", "scripting" ], "action": { "default_title": "a11y.css", "default_popup": "popup/index.html", "default_icon": { "19": "icons/a11y-css_19.png", "38": "icons/a11y-css_38.png" } }, "background": { "service_worker": "/scripts/background/main.js", "type": "module" }, "content_scripts": [ { "matches": [ "*://*/*" ], "js": [ "/scripts/injected/alt.js" ], "css": [ "/scripts/injected/alt.css" ], "run_at": "document_end" } ], "icons": { "16": "icons/a11y-css_16.png", "48": "icons/a11y-css_48.png", "128": "icons/a11y-css_128.png" }, "web_accessible_resources": [ { "resources": [ "icons/info.svg", "icons/ko.svg", "icons/ok.svg", "scripts/injected/*", "css/*" ], "matches": [ "*://*/*" ] } ]}
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How to download and manually install a11y.css extension for Chrome

Looking for a way to install a11y.css extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install a11y.css extensions manually, this article outlines two simple methods to effortlessly install a11y.css extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download a11y.css extension and manually install through Drag &Drop

If you ever need to manually install a a11y.css extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the a11y.css Extension by clicking the "Download CRX" button on the website.

Look for the a11y.css extension you wish to install. Go to the website and download the a11y.css extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for a11y.css extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the a11y.css extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download a11y.css extension for Chrome and install in Developer Mode

This is another method to install a11y.css extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the a11y.css extension file

Select and download the a11y.css extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the a11y.css extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your a11y.css extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the a11y.css extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install a11y.css extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Jonathan PANSIOT (ID: 0000000db18fff60) Voted 5 ★ - Updated 08/31/2022 handy little tool for wcag audits

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Lukasz Teranet (ID: 00000024012b8f31) Voted 5 ★ - Updated 05/05/2022 Great, except with the extension you have to toggle it a few times depending on what state you last left it in or you won't see anything.

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Paul Stoute (ID: 000000485716b1e5) Voted 4 ★ - Updated 03/06/2021 This is a great effort and it tackles a good amount of details that are commonly missed but it doesn't (from our testing) account for color contrast issues and other commonly found issues when doing audits.

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Mariia Parfeniuk (ID: 0000001c920cdac4) Voted 1 ★ - Updated 10/06/2020 Didn't work