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<!DOCTYPE html>
<meta name="viewport" content="width=device-width, minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
iframe {
width: 200px;
height: 300px;
}
</style>
<h4>This test checks that requesting the viewport size in an iframe causes any pending layout to occur.</h4>
<iframe srcdoc="<!DOCTYPE html><style>html{height:100%}</style>"></iframe>
<script>
async_test(function(t) {
window.onload = t.step_func(function() {
assert_equals(frames[0].window.visualViewport.width, 200,
"Reading width of iframe viewport should match iframe width.");
assert_equals(frames[0].window.visualViewport.height, 300,
"Reading height of iframe viewport should match iframe height.");
// Add overflow so scrollbars appear.
window.frames[0].window.document.body.style.width = "2000px";
window.frames[0].window.document.body.style.height = "2000px";
var viewportWidth = frames[0].window.visualViewport.width;
var viewportHeight = frames[0].window.visualViewport.height;
assert_equals(viewportWidth, frames[0].window.document.documentElement.clientWidth,
"Reading width of iframe viewport should cause a layout and exclude the new scrollbar.");
assert_equals(viewportHeight, frames[0].window.document.documentElement.clientHeight,
"Reading height of iframe viewport should cause a layout and exclude the new scrollbar.");
t.done();
});
});
</script>
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