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What's a valid HTML5 document?

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醉梦人生
醉梦人生 2020-12-01 18:00

I\'ve just been reading the HTML5 author spec. It states that the , and tags are optional

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  • 有刺的猬
    2020-12-01 18:24

    The title element is indeed required, but as Jukka Korpela notes, it also must be non-empty. Furthermore, the content model of the title element is:

    Text that is not inter-element whitespace.

    Therefore, having just a space character in the title element is not considered valid HTML. You can check this in W3C validator.

    So, an example of a minimal and valid HTML5 document is the following:

    <!doctype html><title>a</title>
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  • 你的背包
    2020-12-01 18:26

    This is the minimal HTML5-valid document:

    <!doctype html><title> </title>
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  • 攒了一身酷
    2020-12-01 18:31

    W3C HTML validator maintainer here. FYI with regard to the validator behavior, as of today, the validator now enforces the requirement in the HTML spec that the title element must contain at least one non-whitespace character -

    http://validator.w3.org/nu/?doc=data%3Atext%2Fhtml%3Bcharset%3Dutf-8%2C%3C%2521doctype%2520html%3E%3Ctitle%3E%2520%2520%2520%3C%252Ftitle%3E

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  • 孤独总比滥情好
    2020-12-01 18:39

    While the <html>, <head> and <body> start and end tags are optional, the <title> tags are required, except in special circumstances, so no, your sample is not (ordinarily) valid.

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  • 庸人自扰
    2020-12-01 18:39

    I think you are reading it correctly. Although browsers will even render incorrect HTML (try breaking the rules and FF will render the same).

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