589787.html (567B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <script> 5 function boom() { 6 document.documentElement.offsetHeight; 7 document.getElementById('e').setAttribute('style', ''); 8 document.documentElement.offsetHeight; 9 } 10 </script> 11 <style id="e"> 12 body #a::after { content: "before text"; position: fixed; } 13 </style> 14 </head> 15 16 <body onload="boom();" style="column-count: 2; width: 100px;"> 17 <div>m</div> 18 <div id="a" style="column-count: 2;"> 19 m 20 <br style="float: left;"> 21 m 22 <span style="float: left;">m</span> 23 24 <div style="float: left; column-width: 9999999999px;"></div> 25 </div> 26 </body> 27 </html>