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<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests Stale While Revalidate works for css</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
var request_token = token();
let link_src = "./resources/stale-css.py?token=" + request_token;
let loadLink = async() => {
let link = document.createElement("link");
link.rel = "stylesheet";
link.type = "text/css";
link.href = "resources/stale-css.py?token=" + request_token;
let loaded = new Promise(r => link.onload = r);
document.body.appendChild(link);
await loaded;
return window
.getComputedStyle(document.body)
.getPropertyValue('background-color');
};
promise_test(async t => {
await new Promise(r => window.onload = r);
let bgColor1 = await loadLink();
assert_equals(bgColor1, "rgb(0, 128, 0)", "(initial version loaded)");
let bgColor2 = await loadLink();
assert_equals(bgColor2, "rgb(0, 128, 0)", "(stale version loaded)");
// Query the server again and again. At some point it must have received the
// revalidation request. We poll, because we don't know when the revalidation
// will occur.
while(true) {
await new Promise(r => step_timeout(r, 25));
let response = await fetch(link_src + "&query");
let count = response.headers.get("Count");
if (count == '2')
break;
}
let bgColor3 = await loadLink();
assert_equals(bgColor3, "rgb(255, 0, 0)", "(revalidated version loaded)");
}, 'Cache returns stale resource');
</script>
</body>
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