test_mask_image_CORS.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Test mask-image CORS anonymous retrieval</title>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="/tests/SimpleTest/WindowSnapshot.js"></script>

<style>

.block100 {

  width: 100px;

  height: 100px;

#allow {

/*

   * shape-outside is unnecessary for the mask, but using it ensures that the first frame

   * of the image is decoded and reflow is called before onload is fired. Since the

   * shape-outside uses the same url as the mask, this ensures that the css image resource

   * is decoded and available for the repaint triggered by the call to snapshotRect.

*/

  shape-outside: url("support/blue-100x100.png");

  mask-image: url("support/blue-100x100.png");

  background-color: #00FF00

#refuse {

  shape-outside: url("http://example.com/tests/layout/style/test/support/blue-100x100.png");

  mask-image: url("http://example.com/tests/layout/style/test/support/blue-100x100.png");

  background-color: #FF0000

</style>

<script>

SimpleTest.waitForExplicitFinish();

function checkBothSquares() {

  checkIsColor("allow", "0,255,0,255");

  checkIsColor("refuse", "255,255,255,255");

  SimpleTest.finish();

function checkIsColor(elementId, color) {

  let e = document.getElementById(elementId);

  let r = e.getBoundingClientRect();

  info("Element " + elementId + " has rect " + r.top + ", " + r.left + ", " + r.width + ", " + r.height + ".");

  let canvas = snapshotRect(window, r);

  let context = canvas.getContext('2d');

  // Only check the top left pixel.

  let image = context.getImageData(0, 0, 1, 1);

  let pixel = image.data.toString();

  is(pixel, color, "Element " + elementId + " has expected color.");

</script>

</head>

<body onload="checkBothSquares()">

  <p>There should be a green square, but no red square.</p>

  <div id="allow" class="block100"></div>

  <div id="refuse" class="block100"></div>

</body>

</html>