Well, let’s see what I can site to support my views…
To support the fact (ok, I’ll be fair and at least call it a quasi-fact for now) that IE is the most widely-used browser at present…
http://www.w3schools.com/browsers/browsers_stats.asp
http://www.upsdell.com/BrowserNews/stat.htm
http://www.cen.uiuc.edu/bstats/latest.html
http://www.webreference.com/stats/browser.html
http://www.solar.ifa.hawaii.edu/Admin/browserstats.html
To be fair, my 95% number was off… I do think it was near that last time I had reason to check, but I have no problem believing Mozilla and Opera and others have cut into that a bit. I haven’t done the math across all these references to come up with a number, but at a glance I think somewhere around 80% IE usage seems about right, so I think my premise is essentially supported.
Unfortunately, I cannot find references to support the point that IE supports more standards. In fact I did NOT mean standards that MS has invented. I was referring to a point in time not terribly long ago (some time this year) where I read that IE actually supported more standards than did Mozilla. As I’m thinking about it now, I believe it was referring to CSS-2 support, which IE had a leg-up on other browsers. I don’t know if that’s still true or not, and as I said in my original post, it is NOT the case now in general. Mozilla and Netscape at least, probably Opera and I’m sure some others are in fact currently more standards-compliant than IE overall. I find plenty of reference to support that, so I’m certainly not about to dispute it.
The other point that many, perhaps even most people, design their sites to work in IE and worry about other browsers as an afterthought is a logical extrapolation based on the larger market share of IE. I suspect if you concede the point that IE is the dominant browser by a large margin, then you would also logically conclude, as I do, that sites are primarily designed for IE.
Note that I’m not saying people IGNORE Mozilla, Netscape, Opera or any other browser. I would hope no one does that. What I’m saying is that if a site works in IE, most people will feel that’s good enough, since 80% or so of people will be visiting the site with IE.
Unfortunately, just designing for standards isn’t a sufficient answer either because all browsers don’t support all the standards, or support them incorrectly. Maybe IE is the worst offender, but if it’s also the dominant browser, does it really matter?