Changes to the screen-reader-text CSS class in WordPress 4.9

The screen-reader-text CSSCSS Cascading Style Sheets. class is a small bit of CSS used in WordPress to visually hide text and makemake A collection of P2 blogs at make.wordpress.org, which are the home to a number of contributor groups, including core development (make/core, formerly "wpdevel"), the UI working group (make/ui), translators (make/polyglots), the theme reviewers (make/themes), resources for plugin authors (make/plugins), and the accessibility working group (make/accessibility). it still available to assistive technologies, screen readers, and any other software reading a page.

For a number of years, this CSS class has used an incorrect syntax for the clip property to deal with old Internet Explorer versions. WordPress 4.8 officially dropped support for Internet Explorer versions 8, 9, and 10. This is a good opportunity to update screen-reader-text to a modern, correct syntax and standardize it across the codebase. Furthermore, the clip property is deprecated: some browsers may still support it, but it is in the process of being dropped and it may cease to work at any time.

Worth noting this change applies only to the CSS class used in the WordPress adminadmin (and super admin) pages.

Here’s how the old CSS class looks like:

.screen-reader-text {
	position: absolute;
	margin: -1px;
	padding: 0;
	height: 1px;
	width: 1px;
	overflow: hidden;
	clip: rect(0 0 0 0);
	border: 0;
	word-wrap: normal !important;
}

And here’s how the new CSS class looks like in WordPress 4.9:

.screen-reader-text {
	border: 0;
	clip: rect(1px, 1px, 1px, 1px);
	-webkit-clip-path: inset(50%);
	clip-path: inset(50%);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	position: absolute;
	width: 1px;
	word-wrap: normal !important;
}

The only changes are the clip property value new syntax and the introduction of clip-path.

In the vast majority of cases this small change shouldn’t require any update to plugins and themes. There’s only one case to be aware of and that’s when the screen-reader-text CSS class is used to dynamically reveal some text. In a very few cases, WordPress itself reveals some visually hidden text. For example, when there’s no JavaScriptJavaScript JavaScript or JS is an object-oriented computer programming language commonly used to create interactive effects within web browsers. WordPress makes extensive use of JS for a better user experience. While PHP is executed on the server, JS executes within a user’s browser. https://www.javascript.com/. support or on small screens, screen-reader-text gets reset to make the visually hidden text visible again:

.no-js .some-element .screen-reader-text {
	position: static;
	-webkit-clip-path: none;
	clip-path: none;
	width: auto;
	height: auto;
	margin: 0;
}

If you’re using a similar CSS technique in your pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party or theme admin pages, don’t forget to reset the new clip-path property too.

For more details, see the related changeset and Trac ticket.

#4-9, #dev-notes