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What is the correct way to declare an HTML5 Doctype.

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一整个雨季
一整个雨季 2020-12-30 18:48

What is the correct way to use start tag when creating with HTML5

IE: HTML 4 Strict is like this
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  • 被撕碎了的回忆
    2020-12-30 18:55

    The clearest most definitive answer of what the standard says seems to be for HTML 5.3 at:

    http://w3c.github.io/html/syntax.html#the-doctype

    Note especially the list-items 1 and 3 which specify that the doctype-statement is case-insensitive. Also note the number of spaces inside the statement can vary.

    And note the clause "A DOCTYPE is a required preamble."

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  • 误落风尘
    2020-12-30 18:59

    It's as simple as 

     <!DOCTYPE html>
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  • 执笔经年
    2020-12-30 18:59

    You only need this:

    <!DOCTYPE html> 
<html>
...

    There are several points here. This is supported by all browsers, even old ones like IE6/IE7. All browsers actually nee "html" part from doctype declaration to jump into standards mode.

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  • 隐瞒了意图╮
    2020-12-30 19:01

    you just use

    <!DOCTYPE html> 
<html>
</html>
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  • 遇见更好的自我
    2020-12-30 19:02

    First of all, html5 doctype is not case sensitive.

    Either one of these three will work:

    1) <!DOCTYPE html>

    2) <!DOCTYPE HTML>

    3) <!doctype html>

    You can check the validity here.

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  • 眼角桃花
    2020-12-30 19:02

    The start tag <html> is optional in HTML5, as in HTML 4.01. If used, it must be the first tag. It has different optional attributes: the global attributes of HTML5, and the special manifest attribute. The most common useful attribute in the <html> tag is the lang attribute.

    (The doctype declaration is something quite different, and not a tag at all.)

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