Element from point
/**//*
JavaScript Bible, Fourth Editionby Danny Goodman Publisher: John Wiley & Sons CopyRight 2001ISBN: 0764533428
*/
<HTML><HEAD><TITLE>document.elementFromPoint() Method</TITLE><SCRIPT LANGUAGE="JavaScript">function showElemUnderneath() 
{ var elem = document.elementFromPoint(event.clientX, event.clientY) document.all.mySpan.innerText = elem.id}document.onmouseover = showElemUnderneath</SCRIPT></HEAD><BODY ID="myBody"><H1 ID="header">document.elementFromPoint() Method</H1><HR ID="myHR"><P ID="instructions">Roll the mouse around the page. The coordinatesof the mouse pointer are currently atop an element<BR ID="myBR">whose ID is:"<SPAN ID="mySpan" STYLE="font-weight:bold"></SPAN>".</P><FORM ID="myForm"><INPUT ID="myButton" TYPE="button" VALUE="Sample Button" onClick=""> </FORM><TABLE BORDER=1 ID="myTable"><TR ID="tr1"> <TD ID="td_A1">Cell A1</TD> <TD ID="td_B1">Cell B1</TD></TR><TR ID="tr2"> <TD ID="td_A2">Cell A2</TD> <TD ID="td_B2">Cell B2</TD></TR></TABLE><H2 ID="sec1">Section 1</H2><P ID="p1">Lorem ipsum dolor sit amet, consectetaur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim adminim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</P><H2 ID="sec2">Section 2</H2><P ID="p2">Duis aute irure dolor in reprehenderit involuptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deseruntmollit anim id est laborum.</P><DIV ID="myDIV" STYLE="position:absolute; top:340; left:300; background-color:yellow">Here is a positioned element.</DIV></BODY></HTML>