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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.

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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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 

              
                <div class="stuff">
<div class="textBox">
  <input 
         class="text" 
         type="textbox"
         placeholder="Email Address"
         onkeyup="this.setAttribute('value', this.value);"
         value=""/>
  <label class="label">Email Address</label>
  <label class="error"></label>
</div>
<div class="textBox">
  <input 
         class="text" 
         type="password"
         placeholder="Password"
         onkeyup="this.setAttribute('value', this.value);"
         value=""/>
  <label class="label">Password</label> 
  <label class="error"></label>
</div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Roboto');

body {
  background-color: #0288D1;
  font-family: 'Roboto', sans-serif;  
}
.stuff {
  width: 25vw;
}
.textBox {
  position: relative;
  width: 100%;
  padding-top: 10px;
  height: 45px;
  display: inline-flex;
  margin-bottom: 3vh;
}
.textBox .text {
  font-weight: 500;
  width: calc(100% - 2vw);
  height: 27px;
  padding-left: 0.5vw;
  background-color: transparent;
  color: white;
  position: absolute;
  bottom: 0px;
  outline: none;
  border-style: solid;
  border-color: #E3E7EA;
  border-width: 0px 0px 2px 0px;
  font-size: 20px;
  -webkit-transition: border-color 0.45s linear;
  transition: border-color 0.45s linear;
}

.textBox > input.text:focus {
  border-color: #B2FF59;
}

.textBox .label {
  opacity: 0.1;
  pointer-events: none;
  z-index: 1;
  color: #C0C0C0;
  position: absolute;
  padding-left: 0.5vw;
  bottom: 3px;
  font-size: 20px;
  font-weight: 300;
  -webkit-transition-property: opacity bottom font-size;
  transition-property: opacity bottom font-size;
  -webkit-transition-duration: 0.45s;
  transition-duration: 0.45s;
  -webkit-transition-timing-function: cubic-bezier(.68,-0.55,.27,1.55);
  transition-timing-function: cubic-bezier(.68,-0.55,.27,1.55);
}

.textBox .error {
  position: absolute;
  margin-top: 48px;
  width: 100%;
  color: #e74c3c;
  text-align: center;
}

.textBox > input.text:focus ~ .label, .textBox > input.text:not([value=""]) ~ .label {
  opacity: 1;
  z-index: 1;
  bottom: 55%;
  font-size: 12px;
}

.textBox > input.text:focus ~ .label {
  color: #B2FF59;
}

.textBox ::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  color: #2B2B2B;
  font-size: 20px;
  font-weight: 200;
  font-family: 'Roboto', sans-serif;
}
.textBox ::-moz-placeholder { /* Firefox 19+ */
  color: #2B2B2B;
  font-size: 20px;
  font-weight: 200;
  font-family: 'Roboto', sans-serif;
}
.textBox :-ms-input-placeholder { /* IE 10+ */
  color: #2B2B2B;
  font-size: 20px;
  font-weight: 200;
  font-family: 'Roboto', sans-serif;
}
.textBox :-moz-placeholder { /* Firefox 18- */
  color: #2B2B2B;
  font-size: 20px;
  font-weight: 200;
  font-family: 'Roboto', sans-serif;
}
!

JS
!
999px

Console