<html> <head> <script> function clickit() { document.getElementById('button').click(); } window.addEventListener('load', clickit); </script> </head> <body> <div style="width:400px;"> <q style="position:relative;"><q style="position:relative;"> Some random text, some random text, some random text <span style="position: relative;"> Some random text, some random text, some random text </span> </q></q> </div> <script> function doe(){ var q1=document.getElementsByTagName('q')[0]; var q2=document.getElementsByTagName('q')[1]; q1.style.position='static'; q2.style.position='static'; } //setTimeout(doe,200); </script> <button id="button" onclick="doe()">Clicking this button should not crash Mozilla</button> </body> </html>