1 files changed, 39 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html b/testing/web-platform/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html
new file mode 100644
index 0000000000..c6925beb74
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="unclosed-nested-layers-expected.html">
+<title>Canvas test: unclosed-nested-layers</title>
+<h1>unclosed-nested-layers</h1>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
+<canvas id="canvas" width="1" height="1">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  var placeholder = document.getElementById('canvas');
+  var offscreen = placeholder.transferControlToOffscreen();
+  const ctx = offscreen.getContext('2d');
+  offscreen.width = offscreen.height = 200;
+
+  ctx.fillStyle = 'rgba(0, 0, 255, 1)';
+  ctx.fillRect(60, 60, 75, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'rgba(225, 0, 0, 1)';
+  ctx.fillRect(50, 50, 75, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'rgba(0, 255, 0, 1)';
+  ctx.fillRect(70, 70, 75, 50);
+
+  ctx.endLayer();
+  // Missing ctx.endLayer() here.
+
+  function draw () {
+    // Wait until frame propagates.
+    if(placeholder.width != 200) {
+      requestAnimationFrame(draw);
+    } else {
+      document.documentElement.classList.remove("reftest-wait");
+    }
+  }
+  requestAnimationFrame(draw);
+</script>