I know how to do it with this method.. <FONT STYLE="BACKGROUND-COLOR: #FFFF00">, but it doesn't show the highlighting in Firefox. Is there a cross-browser standard for doing this?
What you use isn't standards compliant and has been obsolete for years already. Try something like this: <span style="background:#ffff00;">Highlighted text</span> Code (markup):
Do what risoknop said or just visit a Google cache, view source, and see how they highlight the background. <b style="color:black;background-color:#ffff66"> Code (markup):
You should try what risoknop says. You could also have the background color attribute in an external CSS file and then reference it using classes in your HTML. That way, if you ever decide to change the yellow background to red (due to theme color style or similar), you'd just need to change it in one place. Google is not known for having standards compliant code