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<!DOCTYPE html>
<meta charset="utf-8">
<title>fetchpriority: verify basic invariants for adjustments</title>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1880528"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const fetchpriorities = ["auto", "low", "high"];
const prioritiesWhenFetchpriorityDisabled = {
"link-preload-script": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_HIGHEST,
"module-script": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"async-or-defer-script": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"script-in-head": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"other-script": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"link-preload-font": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_HIGH,
"link-preload-fetch": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"deferred-style": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"link-preload-style": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_HIGHEST,
"non-deferred-style": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"global-fetch-api": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
"images": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_LOW,
"media": SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
};
for (const name in prioritiesWhenFetchpriorityDisabled) {
let adjustments = {};
for (const fetchpriority of fetchpriorities) {
adjustments[fetchpriority] = SpecialPowers.getIntPref(`network.fetchpriority.adjustments.${name}.${fetchpriority}`);
}
test(() => {
// The higher the internal priority, the smaller the integer value.
assert_less_than_equal(adjustments.high, adjustments.auto, "Internal priority for high is at most the one for auto");
assert_less_than_equal(adjustments.auto, adjustments.low, "Internal priority for auto is at most the one for low");
}, `${name}: adjusted priorities for low/auto/high have proper ordering.`);
test(() => {
assert_less_than(adjustments.high, adjustments.low, "Internal priority for high is less than the one for low");
}, `${name}: at least one of fetchpriority="high" or fetchpriority="low" has any effect.`);
test(() => {
const priority = prioritiesWhenFetchpriorityDisabled[name];
const predefinedPriorities = [
SpecialPowers.Ci.nsISupportsPriority.PRIORITY_HIGHEST,
SpecialPowers.Ci.nsISupportsPriority.PRIORITY_HIGH,
SpecialPowers.Ci.nsISupportsPriority.PRIORITY_NORMAL,
SpecialPowers.Ci.nsISupportsPriority.PRIORITY_LOW,
SpecialPowers.Ci.nsISupportsPriority.PRIORITY_LOWEST
];
for (const fetchpriority of fetchpriorities) {
const adjustedPriority = priority + adjustments[fetchpriority];
assert_true(predefinedPriorities.includes(adjustedPriority), `Internal priority for ${fetchpriority} is in the predefined set of priorities.`);
}
}, `${name}: adjusted priorities belong to the predefined set.`);
}
</script>
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