Because developing on that many web standards when the other three have such a huge market share is unnecessarily onerous.
Not supporting one browser or another is rarely if ever a stand against that browser, it's just a decision based on living in reality. I've used and liked Opera in the past, but I've never once tested so much as a web page in Opera since I stopped using it as my primary browser.
Not supporting one browser or another is rarely if ever a stand against that browser, it's just a decision based on living in reality. I've used and liked Opera in the past, but I've never once tested so much as a web page in Opera since I stopped using it as my primary browser.