imagebitmap-renderingcontext/context-preserves-canvas.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/canvas.html#the-imagebitmap-rendering-context">
<script>
test(function() {
    var width = 10;
    var height = 10;
    var canvas = document.createElement("canvas");
    canvas.width = width;
    canvas.height = height;
    var ctx = canvas.getContext('bitmaprenderer');
    var dstCanvas = ctx.canvas;
    assert_true("canvas" in ctx);
    assert_equals(dstCanvas, ctx.canvas);
    assert_equals(canvas, ctx.canvas);
    assert_equals(dstCanvas.width, width);
    assert_equals(dstCanvas.height, height);
}, "Test that ctx.canvas on a ImageBitmapRenderingContext returns the original canvas");
</script>