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chromium/third_party/blink/web_tests/fast/forms/select-popup/popup-menu-resize-after-open.html 

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>
<style>
#menu {
    -webkit-appearance: none;
    width: 100px;
}
</style>
<select id="menu">
<option>o1</option>
<option>o2</option>
</select>
<script>
function openPickerErrorCallback() {
    testFailed('picker didn\'t open')
    finishJSTest();
}
function checkPopupWidth() {
    shouldBe('internals.pagePopupWindow.innerWidth', '150');
    finishJSTest();
}
var menu = document.getElementById('menu');
openPickerDeprecatedJsTest(menu, function() {
    shouldBe('internals.pagePopupWindow.innerWidth', '100');
    internals.pagePopupWindow.addEventListener("resize", checkPopupWidth, false);
    setTimeout(function() {
        testFailed('Popup wasn\'t resized.');
        finishJSTest();
    }, 3000);
    menu.style.width = "150px";
    menu.offsetTop;
}, openPickerErrorCallback);
</script>