I have noticed that when I put text into my Edge project, it looks fine in Edge, but looks slightly blurred/out of a focus when I test it in the browser. At first I thought it was just too small, but even larger text seems to have the same problem. Most of the fonts are from Edge Web Fonts, but this problem occurs even when I use the fonts that came with Edge. It looks almost as if it hasn't quite loaded, but even if I leave it for a while, it doesn't make the blurriness better.
Do you have a file we can take a look at? Is your font resized at all?