layout/generic/test/test_overflow_event.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta charset="utf-8">
   5   <title>Test for overflow events</title>
   6   <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
   8   <script type="application/javascript">
   9
  10   SimpleTest.waitForExplicitFinish();
  11
  12   window.addEventListener("load", function(event) {
  13       if (event.target == document) {
  14           test_bug981637();
  15       }
  16   }, false);
  17
  18   /** Test for Bug 981637:  correct overflow event firing in updateOverflow **/
  19
  20   var overflow_fired = false;
  21   function overflow_listener(event) {
  22     overflow_fired = true;
  23   }
  24
  25   function test_bug981637() {
  26     var outerDiv = document.getElementById("bug981637");
  27     var innerDiv = outerDiv.firstChild;
  28     innerDiv.offsetWidth; // flush layout
  29     is(overflow_fired, false, "correct setup");
  30     outerDiv.addEventListener("overflow", overflow_listener, false);
  31     innerDiv.style.transform = "scale(1.2)";
  32     innerDiv.offsetWidth; // flush layout
  33     // run finish step after the overflow event fires (off the event loop)
  34     setTimeout(test_bug981637_step2, 0);
  35   }
  36
  37   function test_bug981637_step2() {
  38     is(overflow_fired, true, "overflow event should have fired after updating transform");
  39     SimpleTest.finish();
  40   }
  41
  42   </script>
  43 </head>
  44 <body>
  45 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=981637">Mozilla Bug 981637</a>
  46 <div id="bug981637" style="overflow: hidden; width: 100px; height: 100px;"><div style="transform: scale(0.8); width: 100px; height: 100px"></div></div>
  47 <pre id="test">
  48 </pre>
  49 </body>
  50 </html>