layout/reftests/transform/partial-prerender-translate-3.html

   1 <!DOCTYPE html>
   2 <html class="reftest-wait reftest-no-flush">
   3 <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
   4 <!--
   5   A test for a partial pre-rendered transform animation moves to a place where
   6   the partial pre-rendered area is completely out of the viewport but still
   7   there remains some amount of area of the entire transform element.
   8   If we mis-recognize it as NOT a jank, checkerboading will happen.
   9   -->
  10 <style>
  11 html {
  12   overflow: hidden;
  13 }
  14 body {
  15   margin: 0px;
  16   padding: 0px;
  17 }
  18 @keyframes anim {
  19   /* translate to a position the partial pre-rendered area is outside of the */
  20   /* viewport but still there should remain visible area. */
  21   to { transform: translateX(-150vw); }
  22 }
  23 #target {
  24   width: 200vw;
  25   height: 200vh;
  26   position: absolute;
  27   transform: translateX(0vw);
  28 }
  29 </style>
  30 <div id="target">
  31   <!--
  32     Put an SVG element so that the transform display item has a blob on
  33     WebRender which means this test properly fails without the proper fix.
  34     -->
  35   <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
  36     <rect fill="green" width="16" height="16"></rect>
  37   </svg>
  38 </div>
  39 <script>
  40 document.addEventListener("MozReftestInvalidate", () => {
  41   target.style.animation = "anim 100s 1s step-start";
  42   target.addEventListener("animationstart", () => {
  43     // animationstart event is fired just before requestAnimationFrame callbacks,
  44     // so we need to wait two rAF to make sure the initial animation value is
  45     // composited on the compositor.
  46     requestAnimationFrame(() => {
  47       requestAnimationFrame(() => {
  48         document.documentElement.classList.remove("reftest-wait");
  49       });
  50     });
  51   });
  52 }, { once: true });
  53 </script>
  54 </html>