32 lines
1.5 KiB
HTML
32 lines
1.5 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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</script>
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<link rel="stylesheet" href="data:text/css,*{}" onload="++NUM_LOADS">
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<script>
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let t = async_test(document.title);
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window.addEventListener("load", t.step_func_done(() => {
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assert_equals(NUM_LOADS, 2, "Load event should've fired for all links");
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}));
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t.step(function() {
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assert_equals(document.styleSheets.length, 1, "Should expose the sheet to the OM before running script");
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// We can't quite assert that NUM_LOADS is zero (even though it almost-always
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// should be the case), in case the parser yields just before executing the
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// script but after parsing the link load.
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let loadsBefore = NUM_LOADS;
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// Intentionally the same href as above, to test caching behavior.
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document.write(`
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<link rel="stylesheet" href="data:text/css,*{}" onload="++NUM_LOADS">
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`);
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assert_equals(document.styleSheets.length, 2, "Should expose both sheets to the OM before running second script");
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assert_equals(NUM_LOADS, loadsBefore, "Shouldn't fire the load event sync");
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assert_not_equals(document.styleSheets[0], document.styleSheets[1], "Should be different sheets");
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});
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</script>
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