2.1. HTML
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Three current standards:
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HTML 4.01 Transitional/Strict.
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XHTML 1.0 Transitional/Strict - corresponds to HTML 4.01, but based on XML.
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XHTML 1.1 - more or less XHTML 1.0 Strict, with a few things
done differently.
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HTML 4.01 is better supported by older browsers, but XHTML can help
detect a lot of bugs.
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The Transitional variants may be recommended, because the strict ones
disallows many features that are better supported by older or buggy
browsers.
Written by Shlomi Fish