Interesting. The font tags appear to have been closed with </font color>. What's weirder is that there are no line breaks so it kind of seems as if an IDE did this.
They are using EM's for font-size, which is a relative measurement.
This means that if you set your font-size to 1.5em, and you have an element inside (as a result of the unclosed tag) also set to 1.5, the one inside is set to 1.5 times that size (or 2.25 of the original 1em). That cascades on and on and on and...
Noting the generator was Frontpage, thought I'd check it out in IE9, where it works fine - even if you use dev tools to change the document mode to standards.
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[ 3.2 ms ] story [ 36.9 ms ] threadNot very pretty.
This means that if you set your font-size to 1.5em, and you have an element inside (as a result of the unclosed tag) also set to 1.5, the one inside is set to 1.5 times that size (or 2.25 of the original 1em). That cascades on and on and on and...
EDIT: And yes, the heading tags have relative font sizes, as cleverjake pointed out.