Which of the following is not a difference between HTML

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Which of the following is not a difference between HTML and XHTML?

1. Special characters must be escaped using character entities in XHTML unlike HTML
2. Tags and attributes are case-insensitive in HTML but not in XHTML
3. Charset in html is “text/html” where as in xhtml it is “application/xml+xhtml”
4. Charset in both html and xhtml is “text/html”
5. None of these

Correct Option: D

HTML is case insensitive while XHTML is case sensitive. In XHTML, special characters can be escaped using character entites but not in HTML. Charset in HTML is “text/html” where as it is “application/xml+xhtml” for XHTML.