Display viewport width with jQuery

viewportwidth.js

/**
 * Display your window width - useful for responsive web design
 * @author: Rutger Laurman
 */

// Ready?
$(function(){

  // Create debug element
  $("body").append("<div style='position:absolute;top:0;left:0;border:1px solid #999;background:#eee;' id='viewportwidth'></div>");

  // Set contents on resizing window
  $(window).resize(function(){$("#viewportwidth").html($(window).width());});

  // Trigger resize event
  $(window).resize();
});