It seems like you need to do a lot of escaping angle brackets to do this (and there's possibly some escaping missing - once I copied "about spreading reblogs via textarea tags to save time on formatting." from the textarea, the word "textarea" had angle brackets around it unescaped. I removed the in my repost and this comment so they wouldn't cause a problem, the other option being to escape them myself.)

I wonder if using markdown instead would reduce this issue.