Inside Technique : The Word
By Scott Isaacs

Demonstrates using the textRange object to determine what word the mouse is over in the document. As you move the mouse over different words in your document, the status bar is updated with the word.

Code

 
 function doMouseMove() {
   var tr = document.body.createTextRange();
   tr.moveToPoint(event.clientX, event.clientY);
   // Expand to the entire word under the mouse.
   tr.expand("word");
   window.status = tr.text;
 }
 
 document.onmousemove = doMouseMove;

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