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Async Clipboard write [image/png ClipboardItem] ->
read [image/png ClipboardItem] tests
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<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<p>The bottom image should display the same image as the top image.</p>
<p>Original Image:</p>
<image id="image-to-copy" width="20" height="20"
<p>Image after copy/paste:</p>
<image id="image-on-clipboard"></image>
<canvas id="canvas" width="20" height="20"></canvas>
// Must compare a bitmap as opposed to simply blob data, because an encoded
// image may have different contents depending on encoder.
async function getBitmapString(blob) {
const imageBitmap = await createImageBitmap(blob);
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.drawImage(imageBitmap, 0,0);
let imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
ctx.clearRect(0, 0, canvas.width, canvas.height);
async function loadBlob(fileName) {
const fetched = await fetch(fileName);
return await fetched.blob();
promise_test(async t => {
const blobInput = await loadBlob('resources/greenbox.png');
assert_equals(blobInput.type, 'image/png');
const clipboardItemInput = new ClipboardItem({'image/png' : blobInput});
await navigator.clipboard.write([clipboardItemInput]);
const clipboardItems = await;
assert_equals(clipboardItems.length, 1);
const clipboardItem = clipboardItems[0];
assert_true(clipboardItem instanceof ClipboardItem);
assert_equals(clipboardItem.types.length, 1);
const blobOutput = await clipboardItem.getType('image/png');
assert_equals(blobOutput.type, 'image/png');
document.getElementById('image-on-clipboard').src =
const comparableInput = await getBitmapString(blobInput);
const comparableOutput = await getBitmapString(blobOutput);
assert_equals(comparableOutput, comparableInput);
}, 'Verify write and read clipboard [image/png Blob]');
promise_test(async t => {
const invalidPngBlob = new Blob(['this text is not a valid png image'],
{type: "image/png"});
const clipboardItemInput = new ClipboardItem({'image/png' : invalidPngBlob});
await promise_rejects(t, "DataError",
}, 'Verify write error on malformed data [image/png ClipboardItem]');
Note: This is a manual test because it writes/reads to the shared system
clipboard and thus cannot be run async with other tests that might interact
with the clipboard.