content-visibility-with-popover-top-layer-006.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-contain/content-visibility/content-visibility-with-popover-top-layer-006.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf8">

<title>CSS Content Visibility: offscreen c-v auto content is relevant when in top layer</title>

<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">

<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">

<meta name="assert" content="offscreen c-v auto content is relevant when in top layer">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/rendering-utils.js"></script>

<style>

#inner {

    content-visibility: auto;

    contain-intrinsic-size: 100px 100px;

</style>

<div popover id="popover">

    <div id="spacer" style="height: 100000px;"></div>

    <div id="inner">

        <div style="height: 200px; width: 200px;">content</div>

    </div>

</div>

<script>

promise_test(async () => {

    popover.showPopover();

    // It takes at least one frame to determine the proximity to the viewport.

    await waitForAtLeastOneFrame();

    // Even though the element with `content-visibility: auto` has an ancestor

    // in the top layer, this element is not in the top layer list (although

    // it's in the top layer stacking context). This means it should not be

    // relevant to the user, because it is not onscreen.

    assert_equals(inner.getBoundingClientRect().height, 100);

});

</script>