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HTML

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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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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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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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.

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HTML 

              
                <!--

Change the data-percentage attribute on `div.pie-chart` to render a fresh pie chart

-->

<div class="pie-chart" data-percentage="33">
  <svg viewBox="-100 -100 200 200">
		<path d="" />
  </svg>
</div>

<h3></h3>
!

CSS 

              
                .pie-chart {
    display: block;
    max-width: 80px;
    max-height: 80px;
    width: 100%;
    padding: 0;
	  margin: 20px auto 0;
    transform-origin: 50% 50%;
    -moz-transform-origin: 40px 40px;
    -ms-transform: rotate(-90deg);
    transform: rotate(-90deg);
}

.pie-chart ~ h3 {
	text-align: center;
	font-family: 'Helvetica', sans-serif;
	font-size: 24px;
	font-weight: normal;
	color: gray;
}

.pie-chart svg {
    max-height: 80px;
    border-radius: 50%;
    border: 1px solid #eee;
    background: #ffffff;
}

.pie-chart svg path {
    fill: #0074a2;
    -moz-transform: translate3d(0, 0, -1px);
}
!

JS 

              
                draw_pie_chart();
window.onresize = draw_pie_chart();

function draw_pie_chart() {
    var percentage, // percentage for the data attribute
        path, // path for svg
        angle, // 1% = 3.6deg; used for coord mapping
        radius = 50, // radius of the pie chart in pixels
        coords = []; // holds Cartesian plane coords for svg path

    percentage = parseInt( document.querySelectorAll( '.pie-chart[data-percentage]' )[0].getAttribute( 'data-percentage' ) );
  
    angle = percentage * 3.6; // 1% ~ 3.6deg
    radius = radius * 2;      // get diameter

    coords[0] = radius * Math.cos( Math.PI * angle / 180 );
    coords[1] = radius * Math.sin( Math.PI * angle / 180 );

    path = 'M0,0 L' + radius + ',0 A' + radius + ',' + radius + ' 0 1,1 ' + coords[0] + ',' + coords[1] + ' Z';

    document.querySelectorAll( '.pie-chart svg path' )[0].setAttribute( 'd', path );
    
    document.querySelectorAll( 'h3' )[0].innerHTML = percentage + '%';

}
!
999px

Console