H1 shows window width

I'm often trying understand which media queries to add to my CSS in order to control changes in the display of content. For this I need to see the window width as it resizes. There are other ways, but I find it more convenient if the page title show the window width.
To enable this, I add the following jQuery code, which is also available as a public gist here.
$(window).resize(function()
{
  $('h1').text($(window).width());
});