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<!doctype html>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<pre>
<script>
test(function() {
let originalWidth = window.innerWidth;
let originalHeight = window.innerHeight;
assert_equals(window.devicePixelRatio, 1, `precondition: ${originalWidth}x${originalHeight}`);
// This precondition holds because of:
// https://searchfox.org/mozilla-central/rev/50215d649d4854812837f1343e8f47bd998dacb5/browser/base/content/browser.js#1717
//
// But if this test starts failing you can just update the assert and the
// factor below accordingly so that the asserts keep passing.
assert_equals(originalWidth, 1280, "precondition");
// Set a fractional scale factor that guarantees that we get a fractional innerWidth
const kFactor = 1.5;
const kOneAppUnit = 1 / 60;
SpecialPowers.setFullZoom(window, kFactor);
assert_approx_equals(window.devicePixelRatio, kFactor, kOneAppUnit);
assert_not_equals(window.innerWidth, originalWidth);
assert_not_equals(window.innerHeight, originalHeight);
if (SpecialPowers.getBoolPref("dom.innerSize.rounded")) {
assert_equals(window.innerWidth, Math.round(originalWidth / kFactor));
assert_equals(window.innerHeight, Math.round(originalHeight / kFactor));
} else {
assert_not_equals(window.innerWidth, Math.round(window.innerWidth));
}
SpecialPowers.setFullZoom(window, 1); // Restore zoom so results can be seen fine...
});
</script>
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