Just to elaborate, the HTML tags are stripped when the comic is submitted. The only exceptions are the italic and underline tags, and I think the bold tag as well (although it doesn't actually do anything as the text is already bold). I think there are also tags for large and small text, although I don't remember what they are.
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"Oh, look, a joke! How original! Thank you, but if I wanted my emotions stimulated pleasurably, I'd get a whore." - Donald B. Jones III