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Selector Collective declaration and nesting

Source: Internet
Author: User
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1. Selector Collective statement

H1,h2,h3 {color:}

No matter what kind of selector, only the public CSS code, can use this collective declaration to streamline the code. The following code is streamlined:

{font-size: 12px; background: 0230}      {font-size: 12px; width: 500px }      . Blue{font-size: 12px;  Color: #0900}      . H1{font-size: 12px;  Font-weight: normal}

After streamlining

#header, Div,.blue,.h1 {font-size: 12px}        {background: 0230} {width: 500px}.              Blue{color: #0900}      . H1{font-weight: normal}

2. The selector is nested. If an ID is in the P tag in Div, the A font is shown in red, as shown below:

<style>      #div p a{color:red}  </style>  <body>  <div id= "div" >      <p><a> links </a></p>  </div>

Doing so eliminates the need to set a selector for a individually

Excerpt from: Kwoojan's "2 Days driving Div+css"

Selector Collective declaration and nesting

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