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What are the valid and invalid XHTML element names

What are the valid and invalid XHTML element names?

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Some valid and invalid XHTML element names are given here:

• < html > - It is valid name.
• < HTML > - It is invalid name, should use lower case letters.
• < xhtml > - It is invalid name, not defined through XHTML specification.
• < Body > - It is invalid name, should use lower case letters.

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