60 lines
2 KiB
HTML
60 lines
2 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>Link element load event doesn't block the parser.</title>
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<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<link rel="help" href="https://html.spec.whatwg.org/#link-type-stylesheet">
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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>
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let NUM_LOADS = 0;
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function sheetUrl(token) {
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return "stylesheet-same-origin.css?" + token;
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}
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function createLink(token) {
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let link = document.createElement("link");
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link.rel = "stylesheet";
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link.href = sheetUrl(token);
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return link;
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}
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function waitForEnoughTimeToLoadSheet(token) {
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return new Promise(resolve => {
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let link = createLink(token);
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link.onload = resolve;
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document.head.appendChild(link);
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});
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}
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promise_test(async function (t) {
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let link = createLink("removed");
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link.addEventListener("load", t.unreached_func("got unexpected load event"));
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link.addEventListener("error", t.unreached_func("got unexpected error event"));
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document.head.appendChild(link);
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link.remove();
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await waitForEnoughTimeToLoadSheet("removed-wait");
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}, "Load event doesn't fire on removed link");
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promise_test(async function (t) {
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let link = createLink("changed-initial");
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let sawLoad = false;
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let load = new Promise(resolve => {
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link.addEventListener("load", function(e) {
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assert_false(sawLoad, "Should only see load event once");
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sawLoad = true;
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resolve();
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});
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});
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link.addEventListener("error", t.unreached_func("got unexpected error event"));
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document.head.appendChild(link);
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link.href = sheetUrl("changed-change");
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await waitForEnoughTimeToLoadSheet("changed-wait");
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await load;
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assert_true(sawLoad, "Should've seen the load event only once");
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}, "Load event doesn't fire for removed sheet");
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</script>
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