<!DOCTYPE html> <!-- webkit-test-runner [ internal:useMockScrollbars=false ] -->
<html>
<head>
    <style>
        body {
            height: 1000px;
        }
    </style>
    <script src="../../../../resources/js-test-pre.js"></script>
    <script src="../../../../resources/ui-helper.js"></script>
    
    <script>
        jsTestIsAsync = true;
        
        window.internals.setUsesOverlayScrollbars(true);

        async function doTest()
        {
            description('Test hover over overlay scrollbar');
            if (!window.internals)
                return;
            
            debug('Document');
            debug(internals.verticalScrollbarState());
            
            let windowWidth = window.innerWidth;

            debug('Hovering vertical scrollbar should show expanded scrollbar');
            await UIHelper.mouseWheelScrollAt(windowWidth - 8, 10);
            await UIHelper.waitForCondition(() => {
                let state = internals.verticalScrollbarState();
                let expanded = state.indexOf('expanded') != -1;
                if (expanded)
                    testPassed('Scrollbar state: ' + state);
                return expanded;
            });

            debug('Unhovering vertical scrollbar should hide it');
            await UIHelper.moveMouseAndWaitForFrame(windowWidth - 20, 10);
            await UIHelper.moveMouseAndWaitForFrame(windowWidth - 25, 10);
            await UIHelper.waitForCondition(() => {
                let state = internals.verticalScrollbarState();
                let thumbHidden = state.indexOf('visible_thumb') == -1;
                let trackHidden = state.indexOf('visible_track') == -1;
                if (thumbHidden && trackHidden)
                    testPassed('Thumb and track hidden');
                return thumbHidden && trackHidden;
            });

            finishJSTest();
        }

        window.addEventListener('load', () => {
            doTest();
        }, false);
    </script>
</head>
<body>
    <script src="../../../../resources/js-test-post.js"></script>
</body>
</html>