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Test Info:

<!doctype html>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<iframe id="frame"></iframe>
<script>
SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({ "set": [["layout.css.devPixelsPerPx", "1.25"]] },
function() {
is(window.devicePixelRatio, 1.25, "devPixelsPerPx should work");
const frame = document.getElementById("frame");
frame.addEventListener("load", function() {
let doc = frame.contentDocument;
let win = frame.contentWindow;
is(win.devicePixelRatio, 1.25, "devPixelsPerPx should work inside the frame");
is(win.getComputedStyle(doc.querySelector("div")).borderTopWidth, "0.8px", "Shouldn't incorrectly round with 60 app units after getting the initial style");
SimpleTest.finish();
});
frame.srcdoc = "<div style='border: 1px solid; display: none;'></div>";
});
</script>