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chromium/third_party/blink/web_tests/external/wpt/imagebitmap-renderingcontext/context-creation.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Canvas's ImageBitmapRenderingContext test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context">
<script>
var width = 10;
var height = 10;

test(function() {
    var canvas = document.createElement("canvas");
    canvas.width = width;
    canvas.height = height;
    var ctx = canvas.getContext('bitmaprenderer');
    assert_true(ctx instanceof ImageBitmapRenderingContext);
}, "Test that canvas.getContext('bitmaprenderer') returns an instance of ImageBitmapRenderingContext");

</script>