1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/tools/templates/reftest_worker.html b/testing/web-platform/tests/html/canvas/tools/templates/reftest_worker.html
new file mode 100644
index 0000000000..e636d3634b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/tools/templates/reftest_worker.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="{{ name }}-expected.html">
+{% if fuzzy %}<meta name=fuzzy content="{{ fuzzy }}">
+{% endif %}
+{% if timeout %}<meta name="timeout" content="{{ timeout }}">
+{% endif %}
+<title>Canvas test: {{ name }}</title>
+<h1>{{ name }}</h1>
+<p class="desc">{{ desc }}</p>
+{% if notes %}<p class="notes">{{ notes }}{% endif %}
+<canvas id="canvas" width="{{ size[0] }}" height="{{ size[1] }}"{{ canvas }}>
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = {% if test_type == 'promise' %}async {% endif %}function(e) {
+    const canvas = new OffscreenCanvas({{ size[0] }}, {{ size[1] }});
+    const ctx = canvas.getContext('2d'{% if attributes %}, {{ attributes }}{% endif %});
+
+    {{ code | trim | indent(4) }}
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d'{% if attributes %}, {{ attributes }}{% endif %});
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>