hiddenStyle.contains("display:none") || hiddenStyle.contains("display: none"));
// 5) Move mouse over div to make tooltip display
// Yes, all three of these are required.
parentDiv.mouseOver();
parentDiv.mouseMove();
parentSubDiv.mouseOver();
// 6) Make sure tooltip is currently visible (style does not contain 'display: none')
String visibleStyle = tooltip1.getStyleAttribute();
assertFalse("Tooltip not visible as expected: ["+visibleStyle+"]",
visibleStyle.contains("display:none") || visibleStyle.contains("display: none"));