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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>

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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.

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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-.

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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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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 

              
                <body>
  <div class='line'>
    <h2 class='flipX'>flip vertical</h2>
  </div>
  <div class="line">
    <h2 class='lineUp'>line up</h2>
  </div>
  <div class='line'>
    <h2 class='flipY'>flip horizontal</h2>
  </div>
  <div class='line'>
    <h2 class='pop-outin'>text pop-out-in</h2>
  </div>
  
</body>
!

CSS 

              
                * {
  font-family: helvetica, arial, sans-serif;
  font-size: 1.5rem;
}

body {
  perspective: 500px;
}

/* clear background */
h2 {
  text-align: center;
  padding: 16px;
  margin: 0;
}

/* crops animations that exceeds one line area */
.line {
  width: 100%;
  height: 4rem;
  overflow: hidden;
  border: 1px solid black;
  padding: 0;
  margin-bottom: 16px;
}

/* flipping class and key frames*/
.flipX {
  animation: 1s anim-flipX ease infinite;
}
@keyframes anim-flipX {
  0% {
    opacity: 0;
    transform: rotateX(90def);
  }
  50% {
    opacity: 1;
    transform: rotateX(720deg);
  }
  100% {
    /* animate nothing to pause animation at the end */
    opacity: 1;
    transform: rotateX(720deg);
  }
}

/* lineup class and keyframes */
.lineUp {
  animation: 2s anim-lineUp ease-out infinite;
}
@keyframes anim-lineUp {
  0% {
    opacity: 0;
    transform: translateY(80%);
  }
  20% {
    opacity: 0;
  }
  50% {
    opacity: 1;
    transform: translateY(0%);
  }
  100% {
    opacity: 1;
    transform: translateY(0%);
  }
}
/* flipY class and keyframes*/
.flipY {
  animation-name: spin, depth;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-duration: 6s;
}
@keyframes spin {
  0% {
    transform: rotateY(0deg);
  }
  100% {
    transform: rotateY(-360deg);
  }
}
@keyframes depth {
  0% {
    text-shadow: 0 0 black;
  }
  25% {
    text-shadow: 1px 0 black, 2px 0 black, 3px 0 black, 4px 0 black, 5px 0 black;
  }
  50% {
    text-shadow: 0 0 black;
  }
  75% {
    text-shadow: -1px 0 black, -2px 0 black, -3px 0 black, -4px 0 black,
      -5px 0 black;
  }
  100% {
    text-shadow: 0 0 black;
  }
}

/* subtle zoom to attention and then back */
.pop-outin {
  animation: 2s anim-popoutin ease infinite;
}

@keyframes anim-popoutin {
  0% {
    color: black;
    transform: scale(0);
    opacity: 0;
    text-shadow: 0 0 0 rgba(0, 0, 0, 0);
  }
  25% {
    color: red;
    transform: scale(2);
    opacity: 1;
    text-shadow: 3px 10px 5px rgba(0, 0, 0, 0.5);
  }
  50% {
    color: black;
    transform: scale(1);
    opacity: 1;
    text-shadow: 1px 0 0 rgba(0, 0, 0, 0);
  }
  100% {
    /* animate nothing to add pause at the end of animation */
    transform: scale(1);
    opacity: 1;
    text-shadow: 1px 0 0 rgba(0, 0, 0, 0);
  }
}

.fromtop {
  animation: 2s anim-fromtop linear infinite;
}
@keyframes anim-fromtop {
  0% { opacity: 0; transform: translateY(-100%);}
  25% { opacity: 1; transform: translateY(0%);}
  50% {
  }
  100% {
  }
}
!

JS
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