jquery $(window).width() and $(window).height() return different values when viewport has not been resized

Question

I am writing a site using jquery that repeatedly calls $(window).width() and $(window).height() to position and size elements based on the viewport

Answer 1

I think what you're seeing is the hiding and showing of scrollbars. Here's a quick demo showing the width change.

As an aside: do you need to poll constantly? You might be able to optimize your code to run on the resize event, like this:

$(window).resize(function() {
  //update stuff
});