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diff --git a/dom/html/crashtests/916322-1.html b/dom/html/crashtests/916322-1.html
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+<canvas height=16 id=gl>
+<script>
+// Without the fix, this would trigger an assertion in the debug build
+document.addEventListener("DOMContentLoaded", DifferentSizes);
+function DifferentSizes() {
+ gl.getContext("2d");
+ gl.removeAttribute('height');
+ gl.toBlob(function() { }, false)
+}
+</script>