body.width = i + 'px'

  if ( window.document.documentElement.scrollLeft != 0 )

  body.height = k + 'px'

  if ( window.document.documentElement.scrollTop != 0 )

I am a web developer, and i am using Iceweasel 31.7.0 (which is based of Firefox) under Linux Debian wheezy. A problem appears when i am writing a javascript code. My goal is to determine a size of screen (i am using typical pc, not any mobile device). So i am writing: var body = window.document.body.style // block to determine width body.height = '1px' for ( var i = 0; ; i++ ) { body.width = i + 'px' window.document.documentElement.scrollLeft = 1 if ( window.document.documentElement.scrollLeft != 0 ) break } i-- // block to determine height body.width = '1px' for ( var k = 0; ; k++ ) { body.height = k + 'px' window.document.documentElement.scrollTop = 1 if ( window.document.documentElement.scrollTop != 0 ) break } k-- body.width = ( i ) + 'px' body.height = ( k ) + 'px' -------------------------------------------------------------------------------------------- So after this code both scroll line appears! When it should not be because i an k variables are choosen maximum without scroll. And, moreover, an error disappears (both scroll lines disappears) when two blocks switched by place each other (first determine height, then width). I'll appreciate at least confirmation that it is an error, even if you cannot provide a patch for Iceweasel. Thank you.