css2.1 box model:
When you define the width and height of the box; if you add padding and border values, the width and height of the box will be expanded
The height of the box = the defined height (padding-top padding-bottom) (border-top border-bottom);
The width of the box = the defined width (padding-left padding-right) ( border-left border-right);
css3.0 box model:
When you define the height of the box; if you add padding and border values, the box size will not change Change, it will shrink to the content area.
The height of the box = the height you define; the width of the box = the width you define;
Usage:
box-sizing: a box model used to control elements Parsing mode
box-sizing:content-box | border-box | inherit;
The default value is content-box: maintain the W3C standard box model, which is the layout of versions before css3.0
Border-box: Redefine the pattern composed of box models.
inherit: Make the element inherit the box model mode of the parent element.
Writing method (for compatibility):
-moz-box-sizing: border-box;
--webkit-box-sizing: border-box;
-moz- box-sizing: border-box;
-ms-box-sizing:border-box;
box-sizing: border-box;
Example:
css3 layout</ title><br></head><br><style><br> *{margin:0;padding:0;}<br> .wrapper{<br> width:960px;<br> margin:0 auto; <br> color:#fff;<br> background:#cccccc;<br> text-align:center;<br> -moz-box-sizing: border-box;<br> --webkit-box- sizing: border-box;<br> -moz-box-sizing: border-box;<br> -ms-box-sizing:border-box;<br> box-sizing: border-box;<br> }<br> .header{<br> background:#38382e;<br> margin-bottom: 10px;<br> border:10px solid red;<br> padding:10px;<br> width:100%;height:100px; <br> box-sizing:inherit;<br> }<br> .sidebar{<br> float:left;<br> width:220px;<br> margin:0px 20px 10px 0px;<br> height:300px; <br> background:#5d33cf;<br> border:10px solid red;<br> padding:10px;<br> box-sizing:inherit;<br> }<br> .content{<br> float:left; <br> width:720px;<br> margin-bottom: 10px;<br> height:300px;<br> background:#c8ca30;<br> border:10px solid red;<br> padding:10px; <br> box-sizing:inherit;<br> } <br> .footer{<br> clear:both;<br> width:100%;<br> height:100px;<br> background:#cc4ad5;<br> border :10px solid red;<br> padding:10px; <br> box-sizing:inherit;<br> }<br></style><br><body><br> <div class="wrapper "><br> <div class="header">Header</div><br> <div class="sidebar">Leftbar</div><br> <div class ="content">Main content</div><br> <div class="footer">Footer</div><br> </div><br></body><br></html></p> <p>Effect: </p> <p> </p> </div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn</div></div></div><div class="nphpSytBox"><span>Previous article：<a class="dBlack" title="Use the overlay feature of JS and CSS to resolve file conflicts_html/css_WEB-ITnose" href="https://m.php.cn/faq/275228.html">Use the overlay feature of JS and CSS to resolve file conflicts_html/css_WEB-ITnose</a></span><span>Next article：<a class="dBlack" title="Use the overlay feature of JS and CSS to resolve file conflicts_html/css_WEB-ITnose" href="https://m.php.cn/faq/275230.html">Use the overlay feature of JS and CSS to resolve file conflicts_html/css_WEB-ITnose</a></span></div><div class="nphpSytBox2"><div class="nphpZbktTitle"><h2>Related articles</h2><em><a href="https://m.php.cn/article.html" class="bBlack"><i>See more</i><b></b></a></em><div class="clear"></div></div><ins class="adsbygoogle"
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