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HTML

About HTML Preprocessors

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

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML 

              
                <body>
    <div>
        <h2>선택자</h2>
        <p>선택자에 대하여 알아보도록 하겠습니다.</p>
        <p>선택자에 대하여 알아보도록 하겠습니다.</p>
        <p>선택자에 대하여 알아보도록 하겠습니다.</p>
        <h3>선택자의 종류</h3>
        <ul>선택자
            <li>인접선택자</li>
            <li>전체선택자</li>
            <li>태그선택자(직접선택자)</li>
            <li>하위선택자</li>
            <li id="id1">아이디선택자</li>
            <li class="class1">클래스선택자1</li>
            <li class="class1">클래스선택자2</li>
            <li>자식선택자
                <ol>
                    <li>두번째메뉴1</li>
                    <li>두번째메뉴2</li>
                    <li>두번째메뉴3</li>
                </ol>
            </li>
            <li>형제선택자</li>
            <span>자식선택자로 지정되지 않았음</span>
        </ul>
        <h3>마무으리!</h3>
        <p>선택자에 대하여 알아봤습니다.</p>
        <h2>형제선택자로 선택됨</h2>
        <p>선택자에 대하여 알아봤습니다.</p>
        <p>선택자에 대하여 알아봤습니다.</p>
        <p>선택자에 대하여 알아봤습니다.</p>
        <h6>나 빼고 같은 h6를 선택할수도 있음</h6>
        <h6>나 빼고 같은 h6를 선택할수도 있음</h6>
        <h6>나 빼고 같은 h6를 선택할수도 있음</h6>
        <h6>나 빼고 같은 h6를 선택할수도 있음</h6>
    </div>
</body>
!

CSS 

              
                /* 전체선택자 */
* {
    margin: 5px;
    padding: 10px;
}

/* 태그(직접)선택자 */
div {
    border: 1px solid black;
}

/* 하위선택자 */
div h3 {
    color: red;
}

/* 아이디선택자 */
#id1 {
    font-size: 25px;
}

/* 클래스선택자 */
.class1 {
    font-style: italic;
}

/* 자식선택자 */
ul > li {
    color: blue;
}

/* 형제선택자 */
ul ~ h2 {
    color: green;
}

/* 인접선택자 */
h2 + p {
    color: purple;
    font-weight: bold;
    font-size: 20px;
}

h6 + h6 {
  color: #232B99;
}
!

JS
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999px

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