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

<!DOCTYPE html>
<p>Test increasing the height of the containing block of a scrollable container with percent height.</p>
<p>One horizontal scrollbar should be seen below.</p>
<div id="target" style="height:450px;">
    <div style="height:50%; overflow-x:scroll;"></div>
</div>