Get all text/html in rectangle or CSS3 Column

gistfile1.js

var getAllTextInColumn = function(rect){
    /*
        rect should be the size and x,y of the column
    */

    if(document.caretPositionFromPoint){
        var caretRangeStart = document.caretPositionFromPoint(rect.left, rect.top);
        var caretRangeEnd = document.caretPositionFromPoint(rect.left+rect.width-1, rect.top+rect.height-1);
    } else if(document.caretRangeFromPoint){
        var caretRangeStart = document.caretRangeFromPoint(rect.left, rect.top);
        var caretRangeEnd = document.caretRangeFromPoint(rect.left+rect.width-1, rect.top+rect.height-1);
    } else {
        return null;
    }

    if(caretRangeStart == null || caretRangeEnd == null) return null;

    var range = document.createRange();
    range.setStart(caretRangeStart.startContainer, caretRangeStart.startOffset);
    range.setEnd(caretRangeEnd.endContainer, caretRangeEnd.endOffset);

    return range.toString();
};