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CSS 默认值参考
trycss_default_h2
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<!DOCTYPE html> <html> <head> <style> /* Default CSS Values */ h2 { display: block; font-size: 1.5em; margin-top: 0.83em; margin-bottom: 0.83em; margin-left: 0; margin-right: 0; font-weight: bold; } </style> </head> <body> <p>An h2 element is displayed like this:</p> <h2>This is heading 2</h2> <p>A customized h2 element (changed font-weight):</p> <h2 style="font-weight:normal;">This is heading 2</h2> </body> </html>