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