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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                visually hidden via scale 0 and position: absolute;
<p>
<button>
	here's a test
	<span class=vs-hidden>scaled away</span>
</button>
</p>
<p>Anyone find any problems with this?</p>

<p>JAWS, Narrator, NVDA with Edge all seem to behave just fine. As do Firefox with JAWS and NVDA, and Safari on macOS with VoiceOver. Seems also fine with iOS VO+Safari and Android TalkBack with Firefox or Chrome.
</p>
<p>In none of these cases do we get the odd focus rings that have occurred with other visually hidden styles, as the content is scaled down to zero.  Also because not hacked into a 1px by 1px box, there's no text wrapping occurring, so no need to fix that issue. </p>
!

CSS 

              
                .vs-hidden {
  position: absolute;
	 transform: scale(0);
}
!

JS
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999px

Console