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See syntax-checking, autoclosing, reloading

Interesting plugins: ZenCoding and sparkup: They both implement short ways to type html such as

    html>body>table>tr>3*td

which you can then expand to HTML

interesting filetype specific commands and mappings

    command! -buffer FormatHTML %!xmllint --format --html %

You can create a similar command for htmltidy executable easily. (Do you want to contribute it?)

alternatives & additional tools