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<!DOCTYPE html>
<title>Cached images can bypass revalidation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<div id="imageDiv1"></div>
<div id="imageDiv2"></div>
<canvas id="canvas"></canvas>
<script>
function getImagePixel(image)
{
canvas.getContext("2d").drawImage(image, 0, 0, 10, 10);
return canvas.getContext("2d").getImageData(0, 0, 1, 1).data;
}
let resolve;
promise_test(async (t) => {
const url = "image.py?id=" + token();
let promise = new Promise(r => resolve = r);
imageDiv1.innerHTML = `<img src="${url}" onload="resolve()"></img>`;
await promise;
const url2 = "image.py?id=" + token();
promise = new Promise(r => resolve = r);
imageDiv1.innerHTML = `<img src="${url2}" onload="resolve()"></img>`;
await promise;
promise = new Promise(r => resolve = r);
imageDiv2.innerHTML = `<img id="image2" src="${url}" onload="resolve()"></img>`;
await promise;
assert_array_equals(getImagePixel(image2), [0, 255, 0, 255]);
}, "Images can bypass no-cache");
</script>
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