将会显示项目的开头标记和结尾标记。

The element's opening and closing tags are displayed.

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标记对称，可辨认项目的开头标记和结尾标记。

Tag matching to identify the opening and closing tags for an element.

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第5行：XHTML文档必须包含开始和结尾标记。

Line 5: XHTML documents must include opening and closing tags.

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