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@mcclure111 I grew up on an obscure and badly coded forum, and it allowed arbitrary HTML in comments (until it died - around 2005?)
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@mcclure111 It turned out that social norms were enough to prevent (obvious) abuse - that, and a moderation system that would hide comments if they got below a -5 threshold. Enough folks would fake the right requests to hide the comment if you broke the page.