导读：!doctype html public -//w3c//dtd xhtml 1.0 strict//en http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd html xmlns=http://www.w3.org/1999/xhtml head meta http-equiv=content-type content=text/html; charset=utf-8 / title111cn.net/title style...
<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>111cn.net</title>
<style type="text/css教程">
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position:absolute;
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left:50%;
margin:-150px 0 0 -200px;
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height:300px;
border:1px solid red;
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<div>111cn.net- div css布局 常见问题</div>
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