Markup validation for doctype
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But recently I found that using this method will cause problems, see the code: Copy code The code is as follows:<!DOCTYPE HTML> <html> <head> <title>test page</title> </head> <body> <p><div>a</div></p> </body> </html> If this code is tested with w3c markup validation, it is found that it can pass the validation. Because html5 validation is still in the experimental stage, it does not detect any illegalities. But if you use <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">, you will find that it does not validate. The reason is that the p tag is special and cannot contain the block tag. It seems that using some experimental features too early may also cause problems. To be on the safe side, it is recommended to use <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">. |
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