scrollbar-hittest2.html - Android社区 - https://www.androidos.net.cn/

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<p><b>BUG ID:</b> <a href="http://bugs.webkit.org/show_bug.cgi?id=6149">http://bugs.webkit.org/show_bug.cgi?id=6149</a> REGRESSION (WebCore-417.5): horizontal scrollbar in overflow with top border doesn't receive mouse events</p>

<p id="test" style="background-color:skyblue; padding:3px;"><b>TO TEST:</b> <br>
Scroll right by clicking in the empty space to the right of the scroll thumb.</p>

<p id="success" style="background-color:palegreen; padding:3px;"><b>TEST PASS:</b> 
Scroll thumb will move to the right.
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<p id="failure" style="background-color:#FF3300; padding:3px;"><b>TEST FAIL:</b>  
Scroll thumb will NOT move at all.
<div id="target" style="width: 400px; overflow: auto; border-top: 20px solid grey; border-bottom: 10px solid blue;">
    <div style="width: 600px; height: 20px; background: green;"></div>
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