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+<!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;
+
+function testCanvas(bitmapCanvas, r, g, b, a)
+{
+ var myCanvas = document.createElement('canvas');
+ myCanvas.width = width;
+ myCanvas.height = height;
+ var myCtx = myCanvas.getContext('2d');
+ myCtx.drawImage(bitmapCanvas, 0, 0);
+ var color = myCtx.getImageData(5, 5, 1, 1).data;
+ assert_array_equals(color, [r, g, b, a]);
+}
+
+promise_test(function() {
+ function testTransferFromImageBitmapNullability(greenImage) {
+ var bitmapCanvas = new OffscreenCanvas(width,height);
+ var bitmapCtx = bitmapCanvas.getContext('bitmaprenderer');
+ bitmapCtx.transferFromImageBitmap(greenImage);
+
+ // Make sure the bitmap renderer canvas is filled correctly.
+ var myCanvas = document.createElement('canvas');
+ var myCtx = myCanvas.getContext('bitmaprenderer');
+ myCtx.transferFromImageBitmap(bitmapCanvas.transferToImageBitmap());
+ testCanvas(myCanvas, 0, 255, 0, 255);
+
+ // Test that after transfering for second time to ImageBitmap produces
+ // a black bitmap of the same size
+ var myCanvas2 = document.createElement('canvas');
+ var myCtx2 = myCanvas2.getContext('bitmaprenderer');
+ myCtx2.transferFromImageBitmap(bitmapCanvas.transferToImageBitmap());
+ testCanvas(myCanvas2, 0, 0, 0, 0);
+ }
+
+ var greenCanvas = document.createElement('canvas');
+ greenCanvas.width = width;
+ greenCanvas.height = height;
+ var greenCtx = greenCanvas.getContext('2d');
+ greenCtx.fillStyle = '#0f0';
+ greenCtx.fillRect(0, 0, width, height);
+
+ return Promise.all([
+ createImageBitmap(greenCanvas),
+ ]).then(([greenImage]) => {
+ testTransferFromImageBitmapNullability(greenImage);
+ });
+},'Test that transferToImageBitmap works and that resets the imagebitmap to black');
+
+</script>