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