| HTML 4.01 | ||||
| Allows upper / lowercase tags | ||||
| Non-close tags, others (sloppy) | ||||
| doesn’t require a Doctype | ||||
| XHTML | ||||
| More strict, therefore easier to verify | ||||
| Based on XML | ||||
| Requires a doctype | ||||
| In theory you can extend it to add your own tags | ||||
| Even empty tags must be closed | ||||
| Attributes must be ” ” tized | ||||
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