<blink><marquee><glow><h1> HI </h1></glow></marquee></blink>
Spoiler would be handy, especially with the games forum. You can sort of do it ready with the abbr="your text" but it's a hidden feature, doesn't work on most mobile browsers, has a character limit, shows up as a tooltip so it hides before you can read it, and doesn't work very well in general.