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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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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).

Add External Stylesheets/Pens

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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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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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>
  <head>
  </head>
  <body>
    <h1>Welcome</h1>
    <p>
      This is Vanilla coding!           <br/>
      <br/>
      We are here to teach you how to code.
      <br/>
      Don't be so nervous.
    </p>
  </body>
</html>
!

CSS 

              
                /*

  해보세요 ✅

  h1에 적용된 CSS 코드를 참고해서 p 태그에 새로운 폰트를 적용시켜보세요!

  1) https://fonts.google.com/ 에서 마음에 드는 폰트를 클릭한 후,

  2) select this style을 클릭,

  3) 오른쪽의 "selected families" 탭의 "Use on the web"에 있는 @import를 클릭하시면

  4) 아래에 보이는 것과 같은 @import 코드를 복사할 수 있습니다.

  이후 font-family 속성에 있는 💬값을 해당 폰트의 이름으로 수정해서

  p태그의 텍스트에 여러분이 골라주신 폰트를 적용시켜보세요.

*/

@import url('https://fonts.googleapis.com/css2?family=Mochiy+Pop+P+One&family=Noto+Sans+KR:wght@700&display=swap');

body {
  font-size: 2em;
  /* em 이라는 단위에 대해 알고 계신가요? */
  /* 참고 자료 - https://www.w3schools.com/cssref/css_units.asp */
}

h1 {
  font-family: 'Mochiy Pop P One';
}

p {
  font-family: 💬;
}
!

JS
!
999px

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