title: jQuery .css("margin-top", value) not updating in IE 8 (Standards mode)
body: <p>I'm building an auto-follow div that is bound to the $(window).scroll() event.  Here is my JavaScript.</p>
  
  <pre><code>var alert_top = 0;
  var alert_margin_top = 0;
  
  $(function() {
    alert_top = $("#ActionBox").offset().top;
    alert_margin_top = parseInt($("#ActionBox").css("margin-top"));
  
    $(window).scroll(function () {
      var scroll_top = $(window).scrollTop();
      if(scroll_top &gt; alert_top) {
        $("#ActionBox").css("margin-top", ((scroll_top-alert_top)+(alert_margin_top*2))+"px");
        console.log("Setting margin-top to "+$("#ActionBox").css("margin-top"));
      } else {
        $("#ActionBox").css("margin-top", alert_margin_top+"px");
      };
    });
  });
  </code></pre>
  
  <p>This code assumes that there is this CSS rule in place</p>
  
  <pre><code>#ActionBox {
    margin-top: 15px;
  }
  </code></pre>
  
  <p>And it takes an element with the id "ActionBox" (in this case a div). The div is positioned in a left aligned menu that runs down the side, so it's starting offset is approximately 200 px).  The goal is to start adding to the margin-top value once the user has scrolled past the point where the div might start to disappear off the top of the browser viewport (yes I know setting it to position: fixed would do the same thing, but then it would obscure the content below the ActionBox but still in the menu).</p>
  
  <p>Now the console.log shows that the event is firing every time it should and it's setting the correct value.  But in some pages of my web app the div isn't redrawn.  This is especially odd because in other pages (in IE) the code works as expected (and it works every time in FF, Opera and WebKit).  All pages evaluate (0 errors and 0 warnings according to the W3C validator and the FireFox HTMLTidy Validator), and no JS errors are thrown (according to the IE Developer Toolbar and Firebug).  One other part to this mystery, if I unselect the #ActionBox margin-top rule in the HTML Style explorer in the IE Developer Tools then the div jumps immediately back in the newly adjusted place that it should have if the scroll event had triggered a redraw.  Also if I force IE8 into Quirks Mode or compatibility mode then the even triggers an update.</p>
  
  <p>One More thing, it works as expected in IE7 and IE 6 (thanks to the wonderful IETester for that)</p>