Tidy Output is a plugin designed to cleanup and/or format output HTML.

mschelstastic

Tidy Output formats and/or cleans up output HTML based on the configured settings. 
It supports Tidy (PHP library) and DOMDocument for cleanup. Only Tidy is supported 
for formatting.
Additionally, it is possible to indent all of the post content to a certain 
level in order to make it line up properly with the rest of the output. This is 
not necessary when formatting the whole page, however.
Spanish and French translations are included and I’m more than happy to include 
others on request (or improve the existing ones — I only speak English so they 
are probably not the most accurate translations.)

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