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网页编写开头部分<!DOCTYPE .....>问题

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这两种开头有什么区别吗?第一个开头表示什么意思?

星鸿
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慕田峪6141110

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慕田峪6141110

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慕的地6079101

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_bug终结者_

第二个是简化后的写法
随时随地看视频慕课网APP
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