firstTab.assertStyle("border-bottom: 2px solid orange");
}
firstPane.parentNode().assertStyle("border-right: 2px solid orange; border-bottom: 2px solid orange");
tabSet.subElement(emptySpacePath_0).assertStyle("border-bottom: 2px solid orange");
tabSet.subElement(emptySpacePath_1).assertStyle("border-bottom: 2px solid orange");
tabSet.subElement(emptySpacePath_2).assertStyle("border-bottom: 2px solid orange");
// backBorderStyle="3px dashed magenta"
if (selectedTabIndex == 0) {
secondTab.assertStyle("border-top: 3px dashed magenta; border-right: 3px dashed magenta");