At this point, spoiler text done by color change does not work with the iPhone browser, and I'm not sure how/whether it works on other mobile devices. I think Dreamwidth should investigate more global solutions before implementing something like this.

If we go ahead and implement now, my information is that black background/black text is most effective for the Mac OS, which has real problems with white/white. I suggest we make it black/black with a white border, so even people with black backgrounds can see there's spoilers.