1 files changed, 74 insertions, 0 deletions
diff --git a/layout/reftests/transform/partial-prerender-expansion-with-resolution-2.html b/layout/reftests/transform/partial-prerender-expansion-with-resolution-2.html
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index 0000000000..9822296102
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+++ b/layout/reftests/transform/partial-prerender-expansion-with-resolution-2.html
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush" reftest-resolution="0.5">
+<meta name="viewport" content="width=device-width,minimum-scale=0.5,initial-scale=1">
+<!--
+  A variant of partial-prerender-expansion-with-resolution-2.html, a partial
+  pre-rendered transform animation in an iframe with <1.0 resolution.
+  -->
+<style>
+html {
+  scrollbar-width: none;
+}
+body {
+  margin: 0px;
+  padding: 0px;
+}
+</style>
+<iframe style="width:1600px; height:2000px; border: 0"
+        srcdoc="<!DOCTYPE HTML>
+                <html>
+                <style>
+                html {
+                  scrollbar-width: none;
+                }
+                html, body {
+                  margin: 0;
+                  padding: 0;
+                }
+
+                @keyframes anim {
+                  /* The reftest window size is (800x1000) and it's scaled by */
+                  /* 0.5 (= 1600x2000), which means the partial pre-render    */
+                  /* size is (2250x2250) so move to a position inside the     */
+                  /* pre-render area and away from the pre-render right edge, */
+                  /* translateX(-650px), so that we can avoid blurry edges in */
+                  /* comparison with the reference.                           */
+                  to { transform: translateX(-400px); }
+                }
+                #target {
+                  width: 4000px;
+                  height: 4000px;
+                  position: absolute;
+                  transform: translateX(0px);
+                }
+                </style>
+                <div id='target'>
+                  <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4000 4000'>
+                    <rect fill='green' x='0'    width='1600' height='4000'></rect>
+                    <rect fill='blue'  x='1600' width='650'  height='4000'></rect>
+                    <rect fill='red'   x='2250' width='1750' height='4000'></rect>
+                  </svg>
+                </div>
+                <script>
+                window.addEventListener('message', () => {
+                  if (event.data == 'start') {
+                    target.style.animation = 'anim 100s 1s step-start';
+                    target.addEventListener('animationstart', () => {
+                      parent.postMessage('animationstart', '*');
+                    });
+                  }
+                });
+                </script></html>">
+</iframe>
+<script>
+document.addEventListener("MozReftestInvalidate", () => {
+  document.querySelector("iframe").contentWindow.postMessage("start", "*");
+}, { once: true });
+
+window.addEventListener("message", event => {
+  if (event.data == "animationstart") {
+    document.documentElement.classList.remove('reftest-wait');
+  }
+});
+</script>
+</html>