File: test_border_device_pixel_rounding_initial_style.html

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<!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>