1 files changed, 47 insertions, 0 deletions
diff --git a/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-canvas-webgl2.html b/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-canvas-webgl2.html
new file mode 100644
index 0000000000..f7c5f50ecb
--- /dev/null
+++ b/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-canvas-webgl2.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+
+<head>
+  <title>Performance Paint Timing Test: FCP due to canvas</title>
+</head>
+
+<body>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <canvas id="canvas" width="200" height="200"></canvas>
+
+  <script>
+    setup({ "hide_test_state": true });
+    async_test(function (t) {
+      assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
+      const canvas = document.getElementById("canvas");
+      const context = canvas.getContext("webgl2");
+      if (!context) {
+        assert_implements_optional(context, "WebGL 2 Canvas isn't supported.")
+      }
+      context.clearColor(0.3, 0.3, 0.3, 1);
+      context.clear(context.COLOR_BUFFER_BIT);
+      function testPaintEntries() {
+        const bufferedEntries = performance.getEntriesByType('paint');
+        if (bufferedEntries.length < 2) {
+          t.step_timeout(function () {
+            testPaintEntries();
+          }, 20);
+          return;
+        }
+        t.step(function () {
+          assert_equals(bufferedEntries.length, 2, "There should be two paint timing instances.");
+          assert_equals(bufferedEntries[0].entryType, "paint");
+          assert_equals(bufferedEntries[0].name, "first-paint");
+          assert_equals(bufferedEntries[1].entryType, "paint");
+          assert_equals(bufferedEntries[1].name, "first-contentful-paint");
+          t.done();
+        });
+      };
+      t.step(function () {
+        testPaintEntries();
+      });
+    }, "First contentful paint fires due to webgl2 canvas render.");
+  </script>
+</body>
+
+</html>