On the top of your Master page, add this:
<!DOCTYPE html>
It changes the document type to a HTML5-compliant mode.
Remember to change the meta tag "X-UA-Compatible" to a newer version, or delete it completely:
<meta http-equiv="X-UA-Compatible" content="IE=8"/>
Otherwise Internet Explorer will render the page in IE8 compatibility mode, so CSS3 & HTML5 won't work.
When using an older environment, this DOCTYPE declaration seems to be the best and also the most relaxed: HTML 4.0 Transitional in Standards Mode
So, type the following line to the top of your Master page, where the previous setting is, overwriting it:
<!DOCTYPE html PUBLIC "-//W3C//DTD html 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
Remember, don't change the DOCTYPE in your regular pages, only in the Master page! Because it doesn't work that way, it has to be on top of the rendered(master) page.
EDIT: Sometimes it might be best NOT to include any doctype definition, that might break old IE. See more info in this link:
Lots of more info & experience here.
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