javascript - availWidth not working in mozilla & IE -

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as menu becoming big lower resolution, im removing less important buttons....but not working in mozilla & ie ?

javascript

  <script>         if(screen.availwidth<=1345)         {var r1=document.getelementbyid("rem1"); r1.remove();}          if(screen.availwidth<=1255)         {var r2=document.getelementbyid("rem2"); r2.remove();}     </script>

html

<li id='rem1'><a href=''id='pad2'>resources</a></li> <li id='rem2'><a href='' id='pad2'>help</a></li>

the screen.availwidth property seems work ok, alternative can use document.body.clientwidth. remove element can use r1.parentnode.removechild(r1); instead of .remove() method, purpose i'd recommend rather adjust display property here: 

window.onload = window.onresize = function () {     var r1 = document.getelementbyid("pad1");     var r2 = document.getelementbyid("pad2");     r2.style.display = (document.body.clientwidth <= 1345) ? 'none' : 'list-item';     r1.style.display = (document.body.clientwidth <= 1255) ? 'none' : 'list-item'; }

jsfiddle: code + fullscreen


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