1 files changed, 52 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/popovers/popover-animated-show-display.tentative.html b/testing/web-platform/tests/html/semantics/popovers/popover-animated-show-display.tentative.html
new file mode 100644
index 0000000000..f78d8e1236
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/popovers/popover-animated-show-display.tentative.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<link rel=author href="mailto:masonf@chromium.org">
+<link rel=help href="https://open-ui.org/components/popup.research.explainer">
+<link rel=match href="popover-animated-display-ref.tentative.html">
+
+<div popover>This is a popover</div>
+<div class=topmost></div>
+
+<style>
+  [popover] {
+    width: 100px;
+    height: 100px;
+    margin: 1em;
+    left: 0;
+    transition: left 20s steps(2, jump-end) -10s;
+  }
+  [popover]:open {
+    left: 200px;
+  }
+  .topmost {
+    position:fixed;
+    z-index: 999999;
+    top:0;
+    left:0;
+    width:1000px;
+    height:1000px;
+    background:green;
+    margin:0;
+    padding:0;
+  }
+</style>
+
+<script>
+window.onload = () => {
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      // This will show the popover, and start the transition.
+      document.querySelector('[popover]').showPopover();
+      document.getAnimations()[0].ready.then(() => {
+        requestAnimationFrame(() => {
+          requestAnimationFrame(() => {
+            // Take a screenshot now.
+            document.documentElement.classList.remove('reftest-wait');
+          });
+        });
+      });
+    });
+  });
+}
+</script>