He's talking about the quotations.
should be
Here's a quick lesson on quotation marks.
By the way, this goes for EVERY coding language (that I can think of).
When you use quotes in your code, they get paired by the closest ones together.
So, when one's open, the closest one to it will close it.
Code:
[COLOR=#0000FF]"[/COLOR]This text is inside one pair of quotations.[COLOR=#0000FF]"[/COLOR]
If you use the same type of quotations inside one, it's obviously not going to work as planned.
Code:
[COLOR=#0000FF]"[/COLOR]Jim told me he was [COLOR=#0000FF]"[/COLOR]running[COLOR=#FF0000]"[/COLOR] to the bathroom[COLOR=#FF0000]"[/COLOR]
As you can see by the highlights, the pairs of quotes are not the ones you planned on.
However, if you use single quotes inside double quotes, or visa versa, it works just as you want it.
Code:
[COLOR=#0000FF]"[/COLOR]Jim told me he was [COLOR=#FF0000]'[/COLOR]running[COLOR=#FF0000]'[/COLOR] to the bathroom[COLOR=#0000FF]"[/COLOR]
[COLOR=#0000FF]'[/COLOR]Jim told me he was [COLOR=#FF0000]"[/COLOR]running[COLOR=#FF0000]"[/COLOR] to the bathroom[COLOR=#0000FF]'[/COLOR]
So although font size doesn't require the value to be in quotes, you seemed to not understand how they worked.