Output panel and html tags

I discovered that the output panel processes some html tags.

<b>bold</b>
<u>underline</u>
<i>italic</i>
<font color="#4caf50">colored text</font>

What I can't figure out is how to set the background color, and I believe it's possible because the output prefix of a external script shows a light gray background.

So my question is how to set the background color? And is there any other tags besides the above the output panel can interpret?

Thanks!

Use bgcol instead of color inside the font tag. You can also use <blockquote> and <a href="..."> tags.