Fix attribute names and values to make sure they are in valid format and using correct quotes

Fix HTML5 obsolete attributes, converts the attributes to corresponding CSS classes or CSS styles, such as class="cellspacing_0"

Ensures proper indentation of the HTML (make it nice).

Fix javascript filter, ensures that all javascript tags contain the type attribute

Lowercase tags filter, lowercases tag names and attribute names in the HTML

Resolve URL filter, resolves all relative URLs starting with ~/

Self close filter, closes all tags that are self-closing, and missing the end tag

Converts TABLE tags to DIV tags