408
Unless you need to be WC3 compliant, you can actually name all of the elements the same (although I strongly advise against it) and the page will probably still function.
To answer your ?, yes.
In the following example you can:
Change the style.css definition for headerbar (see quote),
OR
Name the element a name not defined in style.css (say myheadertable) and use HTML to mark up the text, avoiding css altogether
OR
Name the element a different name and create a definition for that element in style.css.
EXAMPLE:
in theme.html you can find the following: