What you've stumbled upon here is different browsers' methods in rendering embedded fonts. Each of the browsers you mention here uses a different rendering engine, and each renders fonts in a different way. Even different versions of Internet Explorer render fonts differently from each other. At this point in web technology, there's no great way to duplicate font-rendering across browsers without doing something like replacing text with images or similar hackery. Nevertheless, it's a good thing for us to keep our eye on. Thanks!
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[quote]At this point in web technology, there's no great way to duplicate font-rendering across browsers without doing something like replacing text with images or similar hackery.[/quote]What? No. The problem here is that you're using a logical/semantic tag to try to define a consistent "bold" appearance cross-browser instead of a physical tag. Because, as you say, browsers have their own rendering engines, they will interpret logical tags differently (what does "strong" mean?). The image above shows the second strong element re-rendered as a bold element in Firefox.