Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource

JavaScript

Babel includes JSX processing.

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.

+ add another resource

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.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <h2>.z>*{width:0}</h2>
<ul>
  <li>flex container 내부의 free space 값 계산 편의를 위해 모든 flex item 박스에 <b>width:150px</b> 설정.</li>
  <li>따라서 아래 예제 flex container 내부의 free space 값은 현재 모두 <b>-150px</b>으로 동일하다.</li>
  <li>붉은색으로 강조한 숫자 '<strong>0</strong>, <strong>3</strong>, <strong>6</strong>'은 flex container 내부 수축지수(flex-shrink)의 총 합이다.</li>
  <li>수축지수의 총 합은 실제 DOM에 적용된 flex-shrink 값의 총 합이다.</li>
  <li>박스 기본 크기 + ( free space / 수축지수 총 합 ) * flex-shrink 값 = flex item 크기.</li>
</ul>
<p>!<strong>유의사항</strong>: 이 예제는 계산 편의를 위해 flex-basis 값을 모두 '150px'으로 동일하게 처리했음. 그러나 플렉스 아이템마다 flex-basis 값 또는 width 또는 height 값이 다른 경우 수축 지수에 영향을 미치기 때문에 예제에서 제시한 공식을 사용할 수 없음. 플렉스 아이템의 크기가 각자 다른 경우 free space는 균등하게 분배되지 않고 플렉스 아이템 크기에 정비례하여 분배 됨.</p>

<h2>.z.a>*{flex-shrink:0} // 수축하지 않음. 150+(-150/<strong>0</strong>)*1=150</h2>
<div class="a z">
  <div>150px</div>
  <div>150px</div>
  <div>150px</div>
</div>

<h2>.z.b>*{flex-shrink:1} // 균등 수축. 150+(-150/<strong>3</strong>)*1=100</h2>
<div class="b z">
  <div>100px</div>
  <div>100px</div>
  <div>100px</div>
</div>

<h2>
  .z.c>:first-child{flex-shrink:4} // 150+(-150/<strong>6</strong>)*4=50<br>
  .z.c>:first-child~*{flex-shrink:1} // 150+(-150/<strong>6</strong>)*1=125
</h2>
<div class="c z">
  <div>50px</div>
  <div>125px</div>
  <div>125px</div>
</div>
              
            
!

CSS

              
                .z{display:flex;width:300px;height:32px;background:silver;color:white;outline:5px solid black;margin-bottom:2em;text-align:center;}

.z>*{width:150px;}
.z>:nth-child(1){background:red;}
.z>:nth-child(2){background:green;}
.z>:nth-child(3){background:blue;}

.z.a>*{flex-shrink:0;}
.z.b>*{flex-shrink:1;}
.z.c>:first-child{flex-shrink:4;}
.z.c>:first-child~*{flex-shrink:1;}
              
            
!

JS

              
                
              
            
!
999px

Console