I've been working on knocking down layout bugs that affect the most popular sites lately. Please feel free to try it out and file GitHub issues, especially if you can minimize test cases! You're definitely likely to see various degrees of brokenness on most sites, but the core CSS 2.1/CSS3 layout is pretty solid at this point; there's just a long tail of bugs and corner cases we've got to nail down. This is where finding and isolating the bugs that break the major Web sites is important!
I've been working on knocking down layout bugs that affect the most popular sites lately. Please feel free to try it out and file GitHub issues, especially if you can minimize test cases! You're definitely likely to see various degrees of brokenness on most sites, but the core CSS 2.1/CSS3 layout is pretty solid at this point; there's just a long tail of bugs and corner cases we've got to nail down. This is where finding and isolating the bugs that break the major Web sites is important!