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What does hack mean in CSS?

清浅
清浅Original
2018-12-07 16:36:4710828browse

The hack in CSS is to write different CSS styles for different browsers and versions so that it can present the page effect we want

CSS hack is mainly used To solve browser compatibility issues, you can write different CSS for different browsers, and you can also get the desired page effects in different browsers. Today I will introduce to you in detail what hack is in this article

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What does hack mean in CSS?

Definition of hack:

Hack is caused by browsers from different manufacturers, such as Internet Explorer, Firefox, Chrome, etc., or browsers from the same manufacturer Different versions have different support for CSS, so the generated page effects are also different. At this time, we need to write different CSS for different browsers so that it can be compatible with different browsers at the same time and can be used in different browsers. Get the page effect we want in the browser. In other words, the purpose of hacking is to make your CSS code compatible with different browsers

For example: when we write CSS3 attributes, we often encounter the need to write different codes for different browsers, as shown below 

animation:5s;/*标准版*/
-moz-animation: 5s;/* Firefox */
-webkit-animation:5s;/* Safari 和 Chrome */
-o-animation:5s;/* Opera */

!important problem:

There is a problem with the !important identifier in Internet Explorer 6 and below, if another style with the same attribute appears in the same style declaration block, will cause the identifier to be ignored. This can be used to provide special property values ​​that Internet Explorer 6 and other browsers ignore. But this problem does not exist in Internet Explorer 7 and above

  p
 {
     background: green !important;
     background: red; 
         }
      </style>
   </head>
   <body class="page-body">
      <p>Test</p>

We can switch the IE version through the F12 debugging tool on the IE browser to see the running effect

On IE5:

What does hack mean in CSS?

On IE8:

What does hack mean in CSS?

*html problem

The hack part of the code is represented by an asterisk "*" followed by "html". This is a combination of a universal selector and an element type selector. At some point, these two selectors together before another selector only have an effect in some lower versions of browsers, but have no effect in other browsers. Although it has no effect, it will still not report an error, because it is actually valid 

*html p
         {
            background: green;
            background: red; 
         }
      </style>
   </head>
   <body class="page-body">
      <p>Test</p>

on IE5:

What does hack mean in CSS?

on IE8:

What does hack mean in CSS?

Summary: The above is the entire content of this article. I hope that through this article, everyone can have a certain understanding of hacks

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