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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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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 

              
                <html>
  <body>
    <!--

      해보세요 ✅

      시의 제목에 해당하는 가장 첫번째 줄
      "Do not go hard into that bad night" 부분을
      h1 태그로 감싸보세요.

      h2, h3, h4 태그로도 감싸보세요!

    -->
    Do not go hard into that bad night
    <p>
      Do not go gentle into that good night,<br/>
      Old age should burn and rave at close of day;<br/>
      Rage, rage against the dying of the light.
      <br/><br/>
      Though wise men at their end know dark is right,<br/>
      Because their words had forked no lightning they Do not go gentle into
      that good night.<br/><br/>
      Good men, come on it the last wave by, crying how bright
      Their frail deeds might have danced in a green bay, Rage, rage against the
      dying of the light.
    </p>
  </body>
</html>
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CSS
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JS
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999px

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