The text appears fine in FireFox but does not work in Safari.
Reduction: this is transparent in WebKit, but black in Firefox 2 and Opera:
<span style="color: transparent;">Invisible text</span>
Not a bug. We support the CSS3 keyword transparent. The other browsers are still stuck in CSS2.
Created attachment 14386 [details]
This partial reduction shows that the issue is to be found in the CSS.
" The Open eBook(tm) Publication Structure 1.0.1 [OEB101] extended the 'color' property to also accept the 'transparent' keyword. CSS3 extends the color value to include the 'transparent' keyword to allow its use with all properties that accept a <color> value. This simplifies the definition of those properties in CSS3."
(In reply to comment #3)
Ack! Nevermind. I did not see other comments resolving this bug.
*** Bug 14496 has been marked as a duplicate of this bug. ***