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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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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-.

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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 

              
                <h2>グラデーションの<br><span class="grad_text">見出し</span>と<span class="grad_border">ボーダー</span>を作る方法</h2>
<h3 class="grad_text">こちらがグラデーションの見出しです</h3>
<div class="grad_border wd100%"></div>
!

CSS 

              
                body{
  background-image: linear-gradient(-225deg, #FFF0FF 0%, #D7FFFE 80%);
   font-family: "Sawarabi Mincho"; 
}

h2, h3{
  color: #FF9F04;
  font-size: 40px;
  text-align: center;
  margin: 50px 0;
}
.grad_text{
  background-image: linear-gradient(to right, #b8cbb8 0%, #b8cbb8 0%, #b465da 0%, #cf6cc9 33%, #ee609c 66%, #ee609c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.grad_border{
  border-bottom: 5px solid;
  border-image: linear-gradient(90deg, #fc6076 33%, #ff9a44 66%);
  border-image-slice: 1;
}
.wd100{
  width: 100%;  
}
!

JS
!
999px

Console