You would be best served using the newer way of doing bold,
But there is no bold in that set of underlinings! Are you saying that span class=underline should be p class="underline"? I should use paragraph tags within a sentence? Surely that will create a new line?
You probably missed the Quote between the first underline and the >
I don't see any missing quote. It reads: <span class="underline">. That's pasted from the original html file.
Perhaps I should have said that the html validates without a problem.
I suppose I could simply use italics, though that's not true to the original.