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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /resource-timing/load-from-mem-cache-transfer-size.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<title>This tests transfer size of resource timing when loaded from memory cache.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/entry-invariants.js"></script>
</head>
<body>
<script>
function getScript(url) {
const script = document.createElement("script");
const loaded = new Promise(resolve => {
script.onload = script.onerror = resolve;
});
script.src = url;
document.body.appendChild(script);
return loaded;
}
function add_iframe(url) {
return new Promise(function (resolve) {
var frame = document.createElement('iframe');
frame.src = url;
frame.onload = function () { resolve(frame); };
document.body.appendChild(frame);
});
}
promise_test(async t => {
// Add unique token to url so that each run the url is different to avoid
// flakiness.
let url = 'resources/resource_timing_test0.js?unique=' +
Math.random().toString().substr(2);
let frame;
return add_iframe('resources/iframe-load-from-mem-cache-transfer-size.html')
.then((f) => {
frame = f;
// Load script onto iframe in order to get it into the memory cache.
return frame.contentWindow.getScript(url.split('/')[1])
})
.then(() => {
// Verify that the transferSize in case of normal load is greater than
// 0.
assert_positive_(
frame.contentWindow.performance.getEntriesByType('resource')
.filter(e => e.name.includes(url))[0], ['transferSize']);
// Load the same script onto the parent document. This time the script
// is coming from memory cache.
return getScript(url);
})
.then(() => {
// Verify that the transferSize in case of memory cache load is 0.
assert_zeroed_(
window.performance.getEntriesByType('resource')
.filter(e => e.name.includes(url))[0], ['transferSize']);
});
}, "The transferSize of resource timing entries should be 0 when resource \
is loaded from memory cache.");
</script>
</body>
</html>