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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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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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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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 

              
                <link href="https://fonts.googleapis.com/css?family=Droid+Sans+Mono" rel="stylesheet">
<link rel="prefetch" href="http://www.iconsdb.com/icons/preview/white/check-mark-xxl.png">
<link rel="prefetch" href="http://www.iconsdb.com/icons/preview/white/x-mark-xxl.png">

<div class="abs-center container">
    <div class="abs-center front">
        <svg viewbox="0 0 80 80" class="abs-center rad-progress">
            <circle class="progress-background" cx="40" cy="40" r="35" />
            <circle class="progress-bar" cx="40" cy="40" r="35" stroke-dasharray="220" stroke-dashoffset="-220" />
            <div class="abs-center progress-label">0%</div>
        </svg>
    </div>
    <div class="abs-center back">
        <svg viewbox="0 0 80 80" class="abs-center alt-state">
            <circle class="icon-background" cx="40" cy="40" r="35" fill="#21cd92" stroke="#21cd92" stroke-width="8" />
            <div class="abs-center icon check"></div>
            <div class="abs-center icon error"></div>
        </svg>
    </div>
</div>
!

CSS 

              
                * { box-sizing: border-box; transition: 0.5s cubic-bezier(0.5,0,0.2,1) }
.abs-center { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) }
    
.container 
    width 80px
    height @width
    perspective 5000px
    transform-style preserve-3d
    &.flipped { transform: translate(-50%, -50%) rotateY(180deg); }
    &.complete 
        & .icon-background { fill: #21cd92; stroke: #21cd92; }
        & .error { opacity: 0; transition: 0.3s ease }
    &.error
        & .icon-background { fill: #f44336; stroke: #f44336; }
        & .check { opacity: 0; transition: 0.3s ease }

.front, .back { backface-visibility: hidden; }    
.front { z-index: 2; transform: rotateY(0deg); }
.back { transform: rotateY(180deg) }
    
.rad-progress, .alt-state
    height 80px
    width @height
    border-radius 100%
    
.rad-progress {transform: translate(-50%, -50%) rotateZ(-90deg)}
.progress-background { stroke: rgba(0,0,0,0.08); stroke-width: 8; fill: none }
.progress-bar { stroke: #2195cd; stroke-width: 8; fill: none; }
.progress-label { font-family: 'Droid Sans Mono'; font-size: 14px}
    
.icon
    height 30px
    width @height
    transition 0.3s 0.3s ease
    &.check { background: url('https://skytango.com/wp-content/uploads/2016/11/White-Checkmark-icon.png') center no-repeat; background-size: 130%; }
    &.error { background: url('http://aspiredm.com/wp-content/themes/Aspire2016/library/images/menu-cross.png') center no-repeat; background-size: 90%; }
    /*
    background-size cover !important
    &.check { background: url('http://www.iconsdb.com/icons/preview/white/check-mark-xxl.png') center no-repeat }
    &.error { background: url('http://www.iconsdb.com/icons/preview/white/x-mark-xxl.png') center no-repeat }
    */
!

JS 

              
                // https://uimovement.com/ui/3192/crospots-search/
function update_progress(pct) {
    if(!isNaN(pct)) {
        if(pct > 100) {pct = 100}; // Too High
        if(pct < 0) {pct = 0};     // Too Low
        var offset = (( -parseFloat(pct) /100) * 220) - 220; // Getting offset for the SVG
    
        $('.progress-bar').attr('stroke-dashoffset',offset);
        $('.progress-label').text(Number(Math.round(pct+'e2')+'e-2')+'%'); // Rounds to two decimal places
    };
    
    // Check for finish
    (pct === 100)?( complete() ):( incomplete() );
};

// Complete and Error States
function complete() { $('.container').addClass('flipped complete').removeClass('error'); };
function incomplete() { $('.container').removeClass('flipped complete'); };
function error() { $('.container').addClass('flipped error').removeClass('complete');  };
function no_error() { $('.container').removeClass('flipped error'); };

// For testing
function test() {
    $('.progress-bar').css('transition', '0.12s ease');
    for(var i = 0; i <= 100; i++) { timer_thing(i); };
    setTimeout(function(){ $('.progress-bar').css('transition', '0.4s cubic-bezier(0.5,0,0.2,1)'); }, 10100);
};
function timer_thing(i) { setTimeout(function(){ update_progress(i) }, (100 * i)); };

test();
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999px

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