> IE9 was a fantastic, best-of-its-time browser, and I’ll forever be proud of it. But as IE9 wound down and the Windows 8 adventure began, it was already clear that its lead would not last against the Chrome juggernaut. This is tangential, but I wonder how Chrome got so far ahead, not in market share but in features and quality, even with IE's 10+ year head start. Did Google just throw more programmers at the problem…
Also, I think they had a fairly good test infrastructure from the beginning ( I think they tested new versions of Chrome against Google's index of top million websites ). Good test infrastructure can give you compounded returns as the project goes on.