<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <style type="text/css"> #div1:before { content: "PASS1"; } #div2:before { content: "FAIL2"; content: "PASS2" } #div3:before { content: "FAIL3"; content: normal; } #div4:before { content: normal; content: "PASS4"; } #div5:before { content: "FAIL5"; content: none; } #div6:before { content: "PASS6"; content: none none; } #div7:before { content: "PASS7"; content: normal none; } #div8:before { content: "PASS8"; content: none normal; } #div9:before { content: "PASS9"; content: "FAIL8" none; } #div10:before { content: "PASS10"; content: no-open-quote none; } #div11:before { content: "FAIL11"; content: no-open-quote no-close-quote; } #div12:before { content: "PASS12"; content: none "FAIL12"; } </style> </head> <body> <div id="div1"></div> <div id="div2"></div> <div id="div3"></div> <div id="div4"></div> <div id="div5"></div> <div id="div6"></div> <div id="div7"></div> <div id="div8"></div> <div id="div9"></div> <div id="div10"></div> <div id="div11"></div> <div id="div12"></div> </body> </html>