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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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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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

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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.

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

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HTML 

              
                <svg width='0' height='0'>
  <defs>
    <g id='coord-syst' class='coord-syst'>
      <line x1='0' x2='650' 
            y1='0' y2='0'/>
      <line x1='0' x2='0' 
            y1='0' y2='350'/>
      
      <circle cx='0' cy='0' r='2' />
    </g>
    
    <g id='box-guides' class='box-guides'>
      <line x1='0' x2='150' y1='40' y2='40'/>
      <line x1='75' x2='75' y1='0' y2='80' />
      
      <line x1='0' y1='0' x2='150' y2='80' />
      <line x1='0' y1='80' x2='150' y2='0' />
      
      <circle cx='75' cy='40' r='2' />
    </g>
  </defs>
</svg>
<section class='code'>
  <pre><span class='token token--angled-brackets'>&lt;</span><span class='token token--tag-name'>rect</span> <span class='token token--attr-name'>transform</span><span class='token token--equal'>=</span><span class='token token--quote'>'</span><span class='inf token token--attr-val'></span><span class='token token--quote'>'</span><span class='token token--angled-brackets'>&gt;</span></pre>
</section>
<section>
  <svg>
    <g class='box box--svg box--initial'>
      <rect x='65' y='65' width='150' height='80'/>
      <use xlink:href='#coord-syst'/>
      <use x='65' y='65' xlink:href='#box-guides'/>
    </g>
    <g class='box box--svg box--transforming'>
      <rect x='65' y='65' width='150' height='80'/>
      <use xlink:href='#coord-syst'/>
      <use x='65' y='65' xlink:href='#box-guides'/>
    </g>
  </svg>
  
  <div class='ctrls paused'>
    <button id='c1'>
      <div>play</div>
      <div>pause</div>
    </button>
    <button id='c2'>reset</button>
  </div>
</section>
!

CSS 

              
                @import "compass/css3";

$c: #be4c39;
$bg-c: #e18728;
$axes-c: #333;
$guides-c: #ddd;
$code-bg: #1d1f21;
$t: 6s;

body {
  margin: 0;
  
  > svg { display: none; }
}

section svg {
  overflow: hidden;
  width: 650px; height: 350px;
}

section {
  position: relative;
  width: 650px;
  margin: 0 auto;
}

.box {  
  &--svg {
    rect {
      fill: #e18728;
    }
  }
  
  &--initial {
    opacity: .5;
    
    svg & {      
      .coord-syst line {
        stroke-width: 4;
      }
    }
  }
  
  &--transforming {
    background: rgba($bg-c, .7);
    
    & rect {
      fill-opacity: .7;
      stroke: $bg-c;
      stroke-width: 2;
    }
  }
}

.coord-syst {
  line {
    stroke: $axes-c;
    stroke-width: 2;
  }
  
  circle {
    stroke: #9351a6;
    stroke-width: 4;
  }
}

.box-guides {
  line {
    //opacity: .65;
    stroke: $guides-c;
    stroke-dasharray: 9;
    stroke-width: 2;
  }
  
  circle {
    stroke: $c;
    stroke-width: 5;
  }
}

.meas {
  stroke: #222;
  
  line {
    stroke-dasharray: 7;
  }
  
  text {
    stroke: transparent;
    font: 900 italic 1em serif;
  }
}

.code {
  padding: 0 .5em;
  margin: .25em auto;
  background: $code-bg;
}

.token {
  line-height: 2;
  
  &--angled-brackets { color: #d49b00; }
  &--tag-name { color: #e18728; }
  &--attr-name { color: #be4c39; }
  &--attr-val { color: #4ca454; }
  &--equal { color: #4472b9; }
  &--quote { color: #f4e3dc; }
}

.ctrls {
  position: absolute;
  top: .5em; left: .5em;
  
  button {
    display: block;
    overflow: hidden;
    margin: .25em;
    border: solid 0;
    padding: 0;
    width: 3em; height: 2em;
    font: 1em/2 arial;
    text-align: center;
    cursor: pointer;
  }
  
  div {
    transition: .35s;
    pointer-events: none;
  }
  
  &:not(.paused) div {
    transform: translateY(-100%);
  }
  
  .cssgradients & button {
    width: 2em;
    color: transparent;
    
    &[id='c1'] {
      background: 
        linear-gradient(to right bottom, 
            $bg-c 50%, transparent 50%) 
          50% 1em, 
        linear-gradient(90deg, 
            $guides-c 35%, transparent 35%, 
            transparent 65%, $guides-c 65%) 
          50% 50%, 
        linear-gradient(to right top, 
            $bg-c 50%, transparent 50%) 
          left 50% bottom 1em 
        $axes-c;
      background-repeat: no-repeat;
      background-size: 0 0, 50% 1em;
      transition: .35s;
    }
    
    &[id='c2'] {
      box-shadow: inset 0 0 0 .5em $axes-c;
      background: $guides-c;
    }
  }
  
  .cssgradients &.paused [id='c1'] {
    background-size: 50% .5em, 0 0;
  }
}
!

JS 

              
                Object.getOwnPropertyNames(Math).map(function(p) {
  window[p] = Math[p];
});

/* yeah, doing this is a bad idea... 
 * whatever... 
 * this thing checks whether a number is 
 * in the specified range, 
 * with flag dictating whether the limits are 
 * strict or not 
 * b = upper limit, defaults to 1 
 * a = lower limit, defaults to 0 
 * flag: 
 * strict limits if not specified or 0 
 * non-strict lower limit if divisible by 2 
 * non-strict upper limit if divisible by 3
 */
Number.prototype.ξ = function(b, a, flag) {
  var b = ((b - 1) || 0) + 1, 
      a = a || 0, 
      c1 = (flag && flag%2 === 0) 
  					? (this >= a) 
  					: (this > a), 
      c2 = (flag && flag%3 === 0) 
  					? (this <= b) 
  					: (this < b);
  
  return c1 && c2;
};

var sel1 = '.box--transforming', 
    sel2 = '.token--attr-val', 
    b = document.querySelector(sel1), 
    inf = document.querySelector(sel2), 
    ctrl = document.querySelector('.ctrls'), 
    d = { 'x': 140, 'y': 105 }, 
    s = { 'x': 2, 'y': 1.5 }, 
    tu = 60, 
    t = tu, r_id = null;

var ani = function() {
  var t_val, rt, x, y;
  
  if(t.ξ(tu, 0, 3)) {
    t_val = 'translate(0 0)';
    b.setAttribute('transform', t_val);
    inf.textContent = '';
  }
  
  if(t.ξ(2*tu, tu, 3)) {
    rt = t - tu;
    x = rt*d.x/tu;
    y = rt*d.y/tu;
    t_val = 'translate(' + x + ' ' + y + ')';
    b.setAttribute('transform', t_val);
    t_val = 'translate(' + round(x) + ' ' + 
      										 round(y) + ')';
    inf.textContent = t_val;
  }
  
  if(t.ξ(4*tu, 3*tu, 3)) {
    rt = t - 3*tu;
    x = (1 + rt*(s.x - 1)/tu).toFixed(2);
    y = (1 + rt*(s.y - 1)/tu).toFixed(2);
    t_val = 
      'translate(' + d.x + ' ' + d.y + ') ' + 
      'scale(' + x + ' ' + y + ')';
    b.setAttribute('transform', t_val);
    inf.textContent = t_val;
  }
  
  if(t.ξ(5*tu, 4*tu, 3)) {
    t_val = 
      'translate(' + d.x + ' ' + d.y + ') ' + 
      'scale(' + s.x + ' ' + s.y + ')';
    b.setAttribute('transform', t_val);
    inf.textContent = t_val;
  }
  
  if(t.ξ(6*tu, 5*tu, 3)) {
    rt = t - 5*tu;
    x = -rt*d.x/tu;
    y = -rt*d.y/tu;
    t_val = 
      'translate(' + d.x + ' ' + d.y + ') ' + 
      'scale(' + s.x + ' ' + s.y + ') ' + 
      'translate(' + x + ' ' + y + ')';
    b.setAttribute('transform', t_val);
    t_val = 
      'translate(' + d.x + ' ' + d.y + ') ' + 
      'scale(' + s.x + ' ' + s.y + ') ' + 
      'translate(' + round(x) + ' ' + 
      							 round(y) + ')';
    inf.textContent = t_val;
  }
  
  if(t === 7*tu) { t = 0; }
    
  t++;
  
  r_id = requestAnimationFrame(ani);
};

ctrl.addEventListener('click', function(e) {
  var target = e.target;
    
  if(target.id === 'c1') {
    if(!ctrl.classList.contains('paused')) {
      cancelAnimationFrame(r_id);
      r_id = null;
      ctrl.classList.add('paused');
    }
    else {
      ctrl.classList.remove('paused');
      ani();
    }
  }
  
  if(target.id === 'c2') {
    cancelAnimationFrame(r_id);
    r_id = null;
    t = 100;
    b.setAttribute('transform', 
                   'translate(0 0)');
    inf.textContent = '';
    ctrl.classList.add('paused');
  }
}, false);
!
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