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HTML defer 属性
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<!DOCTYPE html> <html> <body> <h1>The script defer attribute</h1> <script src="/demo/js/demo_defer.js" defer></script> <p>The script above requests information from the paragraph below. Normally, this is not possible, because the script is executed before the paragraph exists.</p> <p id="p1">Hello World!</p> <p>However, the defer attribute specifies that the script should be executed later. This way the script can request information from the paragraph.</p> </body> </html>