html 5は、ポップアッププロンプトボックスを実現し、マスク層に伴ってポップアップボックスを閉じることができる





    
    
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  <pre><code>      href,       ,     button  ,      ,      a  </code></pre> 
  <pre><code>            <code>fixed  auto    </code></pre> 
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