I last heavily worked with CSS in 2010/2011. These still don't feel old to me.
There came a point where if you wrote good HTML/CSS that passed the W3C validator, you were golden on pretty much any device. This still rings true today.
And that point was when the public sector finally abandoned IE6. It has all been peachy since then.
And that point was when the public sector finally abandoned IE6. It has all been peachy since then.