Since these are just interpreted comments, there's 0 impact on actual code.
This removes all lines that match /* vim: set(.*)tw=80: */ with S&R -- there are
a few others scattered around which will be removed manually in a second part.
HTML standardizes proper behavior of colSpan and rowSpan:
The main thing is that getting the .rowSpan and .colSpan IDL properties will now return the actual clamped value that we use.
