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<!doctype html>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<iframe style="border: 0; padding: 0; width: 100.75px; height: 100.75px" srcdoc="<html style='width: 100vw; height: 100vh'>"></iframe>
<script>
onload = function() {
test(() => {
assert_equals(window.devicePixelRatio, 1, `precondition: ${window.innerWidth}x${window.innerHeight}`);
// So that the 100.75 is fractional css pixel, but whole dev pixels, and representable in app units.
SpecialPowers.setFullZoom(window, 4);
let win = document.querySelector("iframe").contentWindow;
const rounded = 101;
const truncated = 100;
const raw = 100.75;
const rect = win.document.documentElement.getBoundingClientRect();
assert_equals(rect.height, raw);
assert_equals(rect.width, raw);
switch (SpecialPowers.getIntPref("dom.innerSize.rounding")) {
case 1:
assert_equals(win.innerWidth, rounded);
assert_equals(win.innerHeight, rounded);
break;
case 2:
assert_equals(win.innerWidth, truncated);
assert_equals(win.innerHeight, truncated);
break;
default:
assert_equals(win.innerWidth, raw);
assert_equals(win.innerHeight, raw);
break;
}
SpecialPowers.setFullZoom(window, 1);
})
};
</script>
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