As the screen shot depicts when we try loading the visualforce page ,tabs are not getting wrapped and gets streched horizontally.What is the reason behind this issue?How can it be rectified?
I face this issue earlier. I think you are using
window.onload in your code. You need to remove that to solve this problem.
You can use
$( document ).ready() of Jquery
or can call the method before
Apex:page closing tag.