getEnclosingTabId()

1<apex:page standardController="Case">
2    <A HREF="#" onClick="testCloseTab();return false">
3        Click here to close this tab</A> 
4
5    <apex:includeScript value="/support/console/53.0/integration.js"/>
6    <script type="text/javascript">
7        function testCloseTab() {
8            //First find the ID of the current tab to close it
9            sforce.console.getEnclosingTabId(closeSubtab);
10        }
11        
12        var closeSubtab = function closeSubtab(result) {
13            //Now that we have the tab ID, we can close it
14            var tabId = result.id;
15            sforce.console.closeTab(tabId);
16        };
17    </script>
18</apex:page>