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<!DOCTYPE html>
<title>Makes sure that Link headers preload images with imagesrcset/imagesizes attributes.</title>
<link rel="help" href="https://github.com/w3c/preload/issues/120">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<body>
<script>
setup({single_test: true});
var iterations = 0;
var expectation = new Array(10).fill(0);
if (window.devicePixelRatio < 1.5) {
expectation[0] = expectation[5] = expectation[8] = 1;
} else if (window.devicePixelRatio >= 1.5) {
expectation[1] = expectation[6] = expectation[9] = 1;
}
function check_finished() {
if (numberOfResourceTimingEntries('resources/square.png?from-header&1x') == expectation[0] &&
numberOfResourceTimingEntries('resources/square.png?from-header&2x') == expectation[1] &&
numberOfResourceTimingEntries('resources/square.png?from-header&3x') == expectation[2] &&
numberOfResourceTimingEntries('resources/square.png?from-header&base') == expectation[3] &&
numberOfResourceTimingEntries('resources/square.png?from-header&200') == expectation[4] &&
numberOfResourceTimingEntries('resources/square.png?from-header&400') == expectation[5] &&
numberOfResourceTimingEntries('resources/square.png?from-header&800') == expectation[6] &&
numberOfResourceTimingEntries('resources/square.png?from-header&150') == expectation[7] &&
numberOfResourceTimingEntries('resources/square.png?from-header&300') == expectation[8] &&
numberOfResourceTimingEntries('resources/square.png?from-header&600') == expectation[9]) {
done();
}
iterations++;
if (iterations == 10) {
// At least one is expected to fail, but this should give details to the exact failure(s).
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&1x', expectation[0]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&2x', expectation[1]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&3x', expectation[2]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&base', expectation[3]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&200', expectation[4]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&400', expectation[5]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&800', expectation[6]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&150', expectation[7]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&300', expectation[8]);
verifyNumberOfResourceTimingEntries('resources/square.png?from-header&600', expectation[9]);
done();
} else {
step_timeout(check_finished, 500);
}
}
window.addEventListener("load", function() {
verifyPreloadAndRTSupport();
step_timeout(check_finished, 500);
});
</script>
</body>
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