firefox-main/testing/web-platform/tests/html/canvas/element/manual/draw-element-image/privacy/scrollbar-thumb-images-ignored-tentative.https.sub.html

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Test Info: Warnings

  • This test has a WPT meta file that expects 1 subtest issues.
  • This WPT test may be referenced by the following Test IDs:
<!DOCTYPE HTML>
<html>
<head>
<title>drawElementImage does not draw cross-origin scrollbar thumb images</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='/html/canvas/resources/canvas-tests.js'></script>
<script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
<style>
#child {
width: 120px;
height: 200px;
background: blue;
position: relative;
}
.scroller::-webkit-scrollbar {
width: 100px;
}
.scroller::-webkit-scrollbar-track {
background: transparent;
}
#sameOrigin {
position: absolute;
left: 0px;
top: 0px;
width: 120px;
height: 100px;
overflow-y: scroll;
}
#sameOrigin::-webkit-scrollbar-thumb {
min-height: 100px;
}
@supports not selector(::-webkit-scrollbar-thumb) {
#sameOrigin {
background-color: #0f0;
}
}
#crossOrigin {
position: absolute;
left: 0px;
top: 100px;
width: 120px;
height: 100px;
overflow-y: scroll;
}
#crossOrigin::-webkit-scrollbar-thumb {
min-height: 100px;
}
.scroll-content {
width: 20px;
height: 200px;
background: lightblue;
}
</style>
</head>
<body>
<canvas id="canvas" width="100" height="200" layoutsubtree>
<div id="child">
<div id="sameOrigin" class="scroller">
<div class="scroll-content"></div>
</div>
<div id="crossOrigin" class="scroller">
<div class="scroll-content"></div>
</div>
</div>
</canvas>
<script>
window.onload = () => {
promise_test(async function(t) {
await waitForCanvasPaint(canvas);
const context = canvas.getContext("2d");
context.drawElementImage(child, 0, 0);
// Fetch all pixel data once to avoid multiple slow readbacks.
const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
let pixel = _getPixelFromImageData(imgData, 60, 50);
assert_array_equals(pixel, [0, 255, 0, 255], "Same origin should draw");
pixel = _getPixelFromImageData(imgData, 60, 150);
assert_array_equals(pixel, [0, 0, 255, 255], "Cross origin should not draw");
});
};
</script>
</body>
</html>