<!DOCTYPE html>
<style>
    body {
        height: 5000px;
    }
</style>
<script src="../../../resources/js-test-pre.js"></script>
<script>
window.jsTestIsAsync = true;
var widthDelta;

function runTest() {
    description("This test checks that the layout viewport rect's width is correctly updated when the window is resized.");
    addEventListener("resize", resizeHandler);

    widthDelta = window.outerWidth - window.internals.layoutViewportRect().width;
    resizeTo(600, 500);
}

function resizeHandler() {
    shouldEvaluateTo("window.internals.layoutViewportRect().width", 600 - widthDelta);
    finishJSTest();
}

</script>
<body onload="runTest()">
<script src="../../../resources/js-test-post.js"></script>
</body>