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Set font size using px

Example analysis:

Use px in the font-size attribute to set the text size, which can completely control the text size.

px: pixel (a point on the computer screen)

Description: px is an absolute unit, specifying the absolute size.

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
<style>
h1 {font-size:40px;}
h2 {font-size:30px;}
p {font-size:14px;}
</style>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a paragraph.</p>
<p>允许在 Internet Explorer 9, Firefox, Chrome, Opera, 和 Safari 中通过缩放浏览器调整文本大小。</p>
<p><b>注意:</b>这个例子在 IE9之前的版本不工作。</p>
</body>
</html>
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