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Test Info:

<!DOCTYPE html>
<meta name="viewport" content="width=device-width, minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
html {
height: 100%;
<h4>This test checks that requesting the viewport size causes any pending layout to occur.</h4>
async_test(function(t) {
window.onload = t.step_func(function() {
assert_equals(window.visualViewport.width, document.documentElement.clientWidth,
"window.visualViewport.width should match the window width.");
assert_equals(visualViewport.height, document.documentElement.clientHeight,
"window.visualViewport.height should match the window height.");
// Add overflow so scrollbars appear. = "2000px"; = "2000px";
var viewportWidth = window.visualViewport.width;
var viewportHeight = window.visualViewport.height;
assert_equals(viewportWidth, document.documentElement.clientWidth,
"Reading viewport width should cause a layout and exclude the new scrollbar.");
assert_equals(viewportHeight, document.documentElement.clientHeight,
"Reading viewport height should cause a layout and exclude the new scrollbar.");