Selector hacks

Red if * html matches in this browser

Red if *:first-child+html matches in this browser

Red if html>body matches in this browser

Red if html>/**/body matches in this browser

Red if html:first-child matches in this browser

Red if html[xmlns*=""] body:last-child matches in this browser

Red if body:nth-of-type(1) matches in this browser

Red if body:first-of-type matches in this browser

Red if html:only-child matches in this browser

Red if @media screen and (-webkit-min-device-pixel-ratio:0) matches in this browser

Attribute hacks

Blue if div { _background: blue} matches in this browser