Thanks for the link, that's a great way to evaluate ideas.
As for this specific problem - it's hard to say without doing surveys, but I'd say every webdev shop in the world does all 5 to some degree, unless they are developing for a corporate intranet with a controlled client base.
The spread of browser platforms right now is the largest it's ever been. There are many shops who have to fight IE6 on the rearguard while trying to be iPad-compatible in the vanguard.
The higher end shops do some formal or scripted testing, but my intuition is that what the average person really want is to do a quick check by hand in one browser, and somehow magically know that it works on all the other ones.
As for this specific problem - it's hard to say without doing surveys, but I'd say every webdev shop in the world does all 5 to some degree, unless they are developing for a corporate intranet with a controlled client base.
The spread of browser platforms right now is the largest it's ever been. There are many shops who have to fight IE6 on the rearguard while trying to be iPad-compatible in the vanguard.
The higher end shops do some formal or scripted testing, but my intuition is that what the average person really want is to do a quick check by hand in one browser, and somehow magically know that it works on all the other ones.