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<!DOCTYPE html> <html> <head> <style> h2.a { visibility: visible; } h2.b { visibility: hidden; } </style> </head> <body> <h1>visibility 属性</h1> <h2 class="a">这个标题是可见的</h2> <h2 class="b">这个标题是隐藏的</h2> <p>请注意，隐藏的标题仍会占用页面空间。</p> </body> </html>