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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

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <h1>text-decorationで作るアンダーライン</h1>

<h2>色の変更(text-decoration-color)</h2>
<p>・指定なし<span class="code">(text-decoration-color: currentcolor;)</span></p><p class="example">テキストに<span class="under-line">アンダーライン</span>を引きます。</p>
<p>・色名で指定<span class="code">text-decoration-color: blue;</span></p><p class="example">テキストに<span class="under-line color-name">アンダーライン</span>を引きます。</p>
<p>・カラーコードで指定<span class="code">text-decoration-color: #F26A44;</span></p><p class="example">テキストに<span class="under-line hex">アンダーライン</span>を引きます。</p>
<p>・rgbaで指定<span class="code">text-decoration-color: rgba(46, 149, 152, .4);</span></p><p class="example">テキストに<span class="under-line rgba">アンダーライン</span>を引きます。</p>

<h2>太さの変更(text-decoration-thickness)</h2>
<p>・指定なし<span class="code">(text-decoration-thickness: auto;)</span></p><p class="example">テキストに<span class="under-line">アンダーライン</span>を引きます。</p>
<p>・pxで指定<span class="code">text-decoration-thickness: 5px;</span></p><p class="example">テキストに<span class="under-line thickness-px">アンダーライン</span>を引きます。</p>
<p>・emで指定<span class="code">text-decoration-thickness: .2em;</span></p><p class="example">テキストに<span class="under-line thickness-em">アンダーライン</span>を引きます。</p>

<h2>位置の調整(text-underline-offset)</h2>
<p>・指定なし<span class="code">(text-underline-offset: auto;)</span></p><p class="example">テキストに<span class="under-line">アンダーライン</span>を引きます。</p>
<p>・pxで指定<span class="code">text-underline-offset: 4px;</span></p><p class="example">テキストに<span class="under-line offset-px">アンダーライン</span>を引きます。</p>
<p>・emで指定<span class="code">text-underline-offset: .1em;</span></p><p class="example">テキストに<span class="under-line offset-em">アンダーライン</span>を引きます。</p>

<h2>スタイルの変更(text-decoration-style)</h2>
<p>・指定なし<span class="code">(text-decoration-style: solid;)</span></p><p class="example">テキストに<span class="under-line">アンダーライン</span>を引きます。</p>
<p>・double<span class="code">text-decoration-style: double;</span></p><p class="example">テキストに<span class="under-line double">アンダーライン</span>を引きます。</p>
<p>・dotted<span class="code">text-decoration-style: dotted;</span></p><p class="example">テキストに<span class="under-line dotted">アンダーライン</span>を引きます。</p>
<p>・dashed<span class="code">text-decoration-style: dashed;</span></p><p class="example">テキストに<span class="under-line dashed">アンダーライン</span>を引きます。</p>
<p>・wavy<span class="code">text-decoration-style: wavy;</span></p><p class="example">テキストに<span class="under-line wavy">アンダーライン</span>を引きます。</p>


<h2>その他：text-decoration-skip-ink</h2>
<p>・指定なし<span class="code">(text-decoration-skip-ink: auto;)</span></p><p class="example">一部の文字では<span class="under-line">このgjqypのように</span>アンダーラインが途切れます。</p>
<p>・"none"を指定<span class="code">text-decoration-skip-ink: none;</span></p><p class="example">どのような文字でも<span class="under-line skip-ink-none">このgjqypのように</span>アンダーラインが途切れません。</p>
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CSS 

              
                body {
  padding: 20px;
}

h2 {
  margin-top: 70px;
}

.code {
  margin-left: 5px;
  padding: 3px 6px;
  background: #ddd;
  color: #EC1B4B;
}

.example {
  margin-left: 40px;
}

.under-line {
   text-decoration-line: underline;
}

.color-name {
  text-decoration-color: blue;
}

.hex {
  text-decoration-color: #F26A44;
}

.rgba {
  text-decoration-color: rgba(46, 149, 152, .4);
}

.thickness-px {
  text-decoration-thickness: 5px;
}

.thickness-em {
  text-decoration-thickness: .2em;
}

.offset-px {
  text-underline-offset: 4px;
}

.offset-em {
  text-underline-offset: .1em;
}

.double {
  text-decoration-style: double;
}

.dotted {
  text-decoration-style: dotted;
}

.dashed {
  text-decoration-style: dashed;
}

.wavy {
  text-decoration-style: wavy;
}

.skip-ink-none {
  text-decoration-skip-ink: none;
}
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JS
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999px

Console