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                ## DTD 介紹 DTD( Document Type Definition 文檔類型定義)是一組機器可讀的規則,它們定義 XML 或 HTML 的特定版本中所有允許元素及它們的屬性和層次關系的定義。在解析網頁時,瀏覽器將使用這些規則檢查頁面的有效性并且采取相應的措施。 DTD 是對 HTML 文檔的聲明,還會影響瀏覽器的渲染模式(工作模式)。
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