html - What's a valid HTML5 document?

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html - What's a valid HTML5 document?

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

I've just been reading the HTML5 author spec. It states that the <html>, <head> and <body> tags are optional. Does that mean that you can leave them out completely and still have a valid HTML5 document?

If I'm interpreting this correctly, it means this should be completely valid:

<!DOCTYPE html>
<p>Hello!</p>

Is this correct?

You can check out the spec here:

http://dev.w3.org/html5/spec-author-view/syntax.html#syntax

"8.1.2.4 Optional tags" is the bit out about it being OK to omit <html>, <head> and <body>

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1 Answer

深蓝 · Answer 1 · 2021-10-17T00:04:12+0000

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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