Trailing slash on base URL, or not?

Simple question here. Whenever the docs mention using the base URL tag in your templates, it's formatted like this:


The trouble is, this doesn't validate in HTML 4.01 Strict - the trailing slash throws "character data not allowed here."

It validates, and seems to work fine, like this:


Any thoughts?

Or you could do this:

But I've gone HTML5 and not looking back

Personally I'm a bit apprehensive about jumping into HTML5 when you still have to use Modernizr or some comparable Javascript for compatibility on certain browsers