I have noticed that rendering of fonts differ considerably if the size is, for example. 11px. Running Windows 7
The following HTML and CSS is used
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Certain font rendering engines may honor the CSS properties that others don't (like letter-spacing, text-rendering, font-stretch, font-size-adjust and others - see the CSS3 Font Module). You could try playing around with those you find, to eventually come up with (almost) uniform rendering across different browsers.