NWSAPI: test class attribute in Quirks Mode

Using NWSAPI select method looking for "[class~=foobar]" selector

Lower case classname foobar

Mixed case classname fooBar

Upper case classname FOOBAR

Using querySelectorAll method looking for "[class~=foobar]" selector

Lower case classname foobar

Mixed case classname fooBar

Upper case classname FOOBAR