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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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-.

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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 

              
                <html>
  <body>
    <h1>My First HTML document..</h1>
    
    <b>body 태그</b>에는 문서의 모든 "내용"이 들어갑니다.
    
    <br/>
    <br/>
    
    <div>
      <b>division 태그</b>는
      문서의 구조를 나누는데에
      가장 일반적으로 사용되는
      <br />
      태그입니다.
    </div>
    
    <p>
      <b>paragraph 태그</b> 안에는 말 그대로 '문단'에 해당하는 내용들이 들어갑니다. <br /> 비교적 긴 텍스트나 이미지가 사용되는 내용을 감싸서, <br /> 해당 내용들이 '문단' 이라는 것을 알려주고 문서를 구조화시킵니다.
    </p>
    
    <!--
      문서 중간에 그어진 선 보이시죠?
      이걸 만들고 싶으시다면 아래의 hr(horizontal rule) 태그를 사용하면 됩니다.
    -->
    <hr>

    <div>
      <h3>HTML은 누가 만들었을까?</h3>

      <!-- 
        img(image) 태그의 src 속성에는
        "이미지의 주소" 가 들어갑니다.

         이미지의 주소는 웹에서 이미지를 우클릭 한 후
        "이미지 주소 복사" 를 누르면 얻을 수 있습니다.
      -->

      <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Tim_Berners-Lee_April_2009.jpg/170px-Tim_Berners-Lee_April_2009.jpg" />

      <br />

      <i>
        World Wide Web과 HTML의 창시자, 팀 버너스 리
      </i>
      
      <!-- a(anchor)태그의 href 속성에는 해당 태그를 클릭했을 때 연결될 문서의 주소가 들어갑니다. -->
      <p>
      팀 버너스리 경(영어: Sir Tim Berners-Lee, OM, KBE, FRS, 1955년 6월 8일 ~ )은 영국의 컴퓨터 과학자이다. 1989년 <a href="https://ko.wikipedia.org/wiki/%EC%9B%94%EB%93%9C_%EC%99%80%EC%9D%B4%EB%93%9C_%EC%9B%B9">월드 와이드 웹</a> 의 하이퍼텍스트 시스템을 고안하여 개발했다. 인터넷의 기반을 닦은 여러 공로로 웹의 아버지라고 불리는 인물 중 하나이다.
      </p>
    </div>
  </body>
</html>
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