third_party/WebKit/LayoutTests/fast/scrolling/fractional-scroll-offset-document.html

   1 <!DOCTYPE HTML>
   2 <body style="width:30000px;height:30000px" onload="runTest()">
   3 </body>
   4
   5 <script src="../../resources/js-test.js"></script>
   6 <script>
   7 description("Verifies that document scrolling supports fractional offset.");
   8
   9 var floatPrecision = 0.00001;
  10 var useIntegerScrollOffset = false;
  11 function checkScrollOffset(offset_x, offset_y)
  12 {
  13     if (useIntegerScrollOffset) {
  14         offset_x = Math.floor(offset_x);
  15         offset_y = Math.floor(offset_y);
  16     }
  17     shouldBeCloseTo('document.scrollingElement.scrollTop', offset_y, floatPrecision);
  18     shouldBeCloseTo('document.scrollingElement.scrollLeft', offset_x, floatPrecision);
  19 }
  20
  21 function scroll()
  22 {
  23     window.scrollTo(0, 0);
  24     eventSender.gestureScrollBegin(100.1, 300.2);
  25     checkScrollOffset(0, 0);
  26     eventSender.gestureScrollUpdate(-20.5, -10.2);
  27     checkScrollOffset(20.5, 10.2);
  28     eventSender.gestureScrollUpdate(10.9, -20.9);
  29     checkScrollOffset(9.6, 31.1);
  30     eventSender.gestureScrollUpdate(100.4, 220.9);
  31     checkScrollOffset(0.0, 0.0);
  32     eventSender.gestureScrollEnd(0, 0);
  33 }
  34
  35 function runTest()
  36 {
  37     if (window.eventSender) {
  38       debug("set PreferCompositingToLCDTextEnabled true");
  39       window.internals.settings.setPreferCompositingToLCDTextEnabled(true);
  40       scroll();
  41
  42       debug("set PreferCompositingToLCDTextEnabled false");
  43       window.internals.settings.setPreferCompositingToLCDTextEnabled(false);
  44       useIntegerScrollOffset = true;
  45       scroll();
  46     }
  47 }
  48
  49 </script>
  50 </html>