Calculate Position of selected text javascript/JQuery?

Question

How to retrieve the position of selected text by calculating it\'s offset immediate after body tag?

For Example consider the following html,

Answer 1

Use following java script function for Highlighting the html page..

function stylizeHighlightedString() 
{
    var range               = window.getSelection().getRangeAt(0);
    var selectionContents   = range.extractContents();
    var span                = document.createElement("span");
    span.appendChild(selectionContents);
    span.setAttribute("class","uiWebviewHighlight");

    span.style.backgroundColor  = "red";
    span.style.color            = "white";

    range.insertNode(span);
}