I'm just curious of all the reasons designers continue to coddle the older browsers.
If we all stop doing it, they'll be forced to upgrade when nothing works properly.
Let's face it people, those still using Flash 4 can't see modern videos, or worse yet they still have it's pre-cursor Shockwave installed.
Those technologies moved forward, the old code won't display the new files, yet the web pages works perfectly on all the browsers.
Not trying to start a Flash discussion, just using it as an example of how they force upgrades and eventually the latest version you need requires the latest browser, etc.
Here's the point:
When the new technology moves forward in browsers, instead of forcing everyone to upgrade like Flash did, us webmasters for whatever reason keep coddling people using the old tech.
Instead, why don't we just cut the umbilical cord and only keep code current for the last couple of browser versions? Even that's enough to make you go bats.
That's why I rely on things like Bootstrap and jQuery to worry about all those backwards compatibility issues and if their code fails, so be it.
I'm not spending one waking moment worrying about MSIE 6, 7 or even 8. They're all past tense.
Bottom line: If everyone stops supporting the old junk, people will have no choice but to upgrade to keep pace or simply stop using the web. We're responsible for the web not evolving as quickly as possible by enabling Neanderthals and Luddites to stay online.