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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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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

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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

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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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HTML 

              
                <div class="Teaser">
  <div class="Teaser-image">1</div>
  <div class="Teaser-text">Cillum amet occaecat consectetur minim sunt occaecat ex incididunt dolore eiusmod elit aliqua ut sed qui est nostrud duis qui dolor aute mollit sed ad adipisicing sunt. Cillum amet occaecat consectetur minim sunt occaecat ex incididunt dolore eiusmod elit aliqua ut sed qui est nostrud duis qui dolor aute mollit sed ad adipisicing sunt.</div>
</div>
<div class="Teaser">
  <div class="Teaser-image">2</div>
  <div class="Teaser-text">Dolor sit deserunt pariatur dolor ut nostrud dolor laborum sunt ut veniam sit et veniam reprehenderit enim nisi nisi. Dolor sit deserunt pariatur dolor ut nostrud dolor laborum sunt ut veniam sit et veniam reprehenderit enim nisi nisi.</div>
</div>
<div class="Teaser">
  <div class="Teaser-image">3</div>
  <div class="Teaser-text">Nulla cupidatat veniam voluptate consequat culpa aute adipisicing id consectetur officia eu laborum veniam quis cupidatat eiusmod elit minim officia pariatur anim.</div>
</div>
<div class="Teaser">
  <div class="Teaser-image">4</div>
  <div class="Teaser-text">Lorem ipsum sunt in sed cupidatat amet commodo pariatur pariatur id sit dolor reprehenderit irure cillum in elit veniam voluptate magna dolor sit dolor in labore exercitation nostrud aliquip ullamco do nisi duis ut ea in cillum ut dolore tempor ut labore non excepteur ea dolor veniam aute est id irure in laborum magna nisi.</div>
</div>
<div class="Teaser">
  <div class="Teaser-image">5</div>
  <div class="Teaser-text">Lorem ipsum voluptate dolor ut duis non commodo ea ut sit voluptate voluptate dolore amet mollit sint et aute in proident anim ut.</div>
</div>
<div class="Teaser">
  <div class="Teaser-image">6</div>
  <div class="Teaser-text">Dolore excepteur deserunt ut cupidatat non elit anim consequat est ut qui magna veniam sed excepteur est elit mollit voluptate adipisicing tempor aliquip in minim labore nostrud nulla eu ut irure dolor labore culpa fugiat magna.</div>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}

.Teaser:not(:first-child) {
  padding-top: calc(100vw / 12);
}

.Teaser-image {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #236c62;
  height: 10rem;
  color: #fff;
}

.Teaser-text {
  background: #0a374e;
  padding: 1rem;
  color: #fff;
}

.Teaser:nth-child(1) {
  margin-left: calc(100vw / 12);
}

.Teaser:nth-child(1) .Teaser-text,
.Teaser:nth-child(4) .Teaser-text {
  width: calc(100vw / 3);
  margin-top: calc(-1 * 100vw / 12);
}

.Teaser:nth-child(1) .Teaser-text {
  margin-right: calc(100vw / 12);
  float: right;
}

.Teaser:nth-child(2),
.Teaser:nth-child(5){
  width: 50%;
}

.Teaser:nth-child(2) {
  float: left;
}

.Teaser:nth-child(2) .Teaser-text {
  margin-left: calc(100vw / 12);
}

.Teaser:nth-child(3),
.Teaser:nth-child(6) {
  width: calc(100vw / 3);
} 

.Teaser:nth-child(3) {
  float: right;
  margin-right: calc(100vw / 12);
  clear: right;
}

.Teaser:nth-child(4) {
  clear: both;
}

.Teaser:nth-child(4) .Teaser-text {
  margin-left: calc(100vw / 12);
  float: left;
}

.Teaser:nth-child(5) {
  float: right;
}

.Teaser:nth-child(5) .Teaser-text {
  margin-right: calc(100vw / 12);
}

.Teaser:nth-child(6) {
  float: left;
  margin-left: calc(100vw / 12);
  clear: left;
}
!

JS
!
999px

Console