third_party/WebKit/LayoutTests/fast/layout/display-none-no-relayout.html

   1 <!DOCTYPE html>
   2 <script src="../../resources/js-test.js"></script>
   3 <style>
   4     .a span {}
   5 </style>
   6 <div id="parent">
   7     <span style="display:none"></span>
   8     <div style="float:left;"></div>
   9     <span></span>
  10 </div>
  11 <script>
  12 // Force style recalc and layout.
  13 document.body.offsetTop;
  14
  15 if (window.internals)
  16     shouldBe("window.internals.needsLayoutCount()", "0", true);
  17
  18 var parent = document.getElementById("parent");
  19
  20 // Changing the class attribute here will cause a style recalc with a resulting
  21 // reattach, but it should not cause a relayout.
  22 parent.className = "a";
  23
  24 if (window.internals) {
  25     shouldBe("window.internals.updateStyleAndReturnAffectedElementCount()", "2", true);
  26     shouldBe("window.internals.needsLayoutCount()", "0", true);
  27 }
  28 </script>