Does the html document declaration (line at the top) of the files make a difference in my rank?
Will the
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
do any better than
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
?
No. All Google cares about is whether or not it can spider the page. It doesn't care whether the page is coded with html or xhtml and doesn't care if the code is valid.
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