gecko-dev/layout/style/test/test_import_preload.html

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HTML

<!doctype html>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
<script src="slow_load.sjs"></script>
<script>
let time = Date.now();
SimpleTest.waitForExplicitFinish();
onload = function() {
let styleTime = parseInt(getComputedStyle(document.documentElement).zIndex, 10);
isnot(styleTime, 0, "Should apply the @import sheet");
ok(!isNaN(styleTime), "Should apply the @import sheet (and not be nan)");
// This is technically a bit racy... Also see the comment in slow_load.sjs about the clamping.
time = time % (Math.pow(2, 31) - 1);
ok(styleTime < time, "Should try to fetch the import before running the script: " + styleTime + " vs. " + time);
SimpleTest.finish();
}
</script>
<style>
@import url(slow_load.sjs?css)
</style>