chromium/third_party/blink/web_tests/paint/invalidation/scroll/horizontal-scrollbar-shrink-container-height-expected.html

<!DOCTYPE html>
<p>Test decreasing the height of the containing block of a scrollable container with percent height.</p>
<p>One horizontal scrollbar should be seen below.</p>
<div style="height:250px;">
    <div style="height:50%; overflow-x:scroll;"></div>
</div>