He also shows a workaround. This is bad behavior, although not strictly inconsistent with the spec, I believe. However, it is inconsistent with the CSS2 marker model, which I think is how lists should be rendered. Sue Sims has a demonstration of this bug. However, if the image is already in the cache, they work fine.
Opera has some problems with the inline box model.
However, its performance on my inlinetest is better than any other current browser. Opera does not seem to support background color on a tr . I was told this is fixed in 3.51, but I haven't checked.