<!DOCTYPE html> <html> <head> <script> function boom() { document.getElementById("d1").appendChild(document.createElement("span")); document.getElementById("d2").style.direction = "rtl"; } </script> </head> <body onload="boom()"> <div id="d1" style="-moz-column-width: 1em;">a b c d</div> <div id="d2"></div> </body> </html>