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.
This is a paragraph.
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。
注意:这个例子在 IE9之前的版本不工作。
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