5 document
.getElementById('a').style
.display
= 'table-column-group';
6 document
.body
.offsetHeight
;
11 div::before { content:
"b";}
12 div::after { content:
"a";}
16 <body onload=
"document.body.offsetHeight; setTimeout(doe,0);">
17 <div style=
"display: table;">
18 <span id=
"a" style=
"display: table-header-group; "></span>