When I was writing my post using IE, pls don't ask why I don't use Chrome :), I suddenly realized the document of my IE is 7 !! I launched Developer Tool by pressing F12 button, and tried to force document mode to "Edge". However somehow when I loaded my blogspot again, it was soon back to IE7 mode :\ I investigated for a while and found that the cause was meta tag on my blog page! See below! <meta content='IE=EmulateIE7' http-equiv='X-UA-Compatible'/> I deleted above line on my blog template, the browser use "Edge" document mode by default.