Try changing the following tags:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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to
<!DOCTYPE html>
<!DOCTYPE html>
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and
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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to
<html>
<html>
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From what I've seen Windows version is more restrictive than Linux version.
Also, from what I know html5 pages are contained in
<!DOCTYPE html>
<html>
</html>
<!DOCTYPE html>
<html>
</html>
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