Cross Browser Selection Range Library?

I’ve developed a cross-browser Range and selection library called Rangy. Its core is not dissimilar in concept to IERange but goes beyond it in terms of implementation of the DOM level 2 Range and HTML5 selection specifications, and also in terms of stability and workarounds for browser bugs. I think it’s the best there is out there.

There are also extra modules for saving, restoring and serializing selections and applying CSS class to ranges and selections.

https://github.com/timdown/rangy

The following uses some Rangy extensions to Ranges to easily iterate over text nodes within a selection and surround each one:

function surroundSelectedText(templateElement){
    var range, sel = rangy.getSelection();
    var ranges = sel.getAllRanges();
    var textNodes, textNode, el, i, len, j, jLen;
    for (i = 0, len = ranges.length; i < len; ++i) {
        range = ranges[i];
        // If one or both of the range boundaries falls in the middle
        // of a text node, the following line splits the text node at the
        // boundary
        range.splitBoundaries();

        // The first parameter below is an array of valid nodeTypes
        // (in this case, text nodes only)
        textNodes = range.getNodes([3]);

        for (j = 0, jLen = textNodes.length; j < jLen; ++j) {
            textNode = textNodes[j];
            el = templateElement.cloneNode(false);
            textNode.parentNode.insertBefore(el, textNode);
            el.appendChild(textNode);
        }
    }
}

var span = document.createElement("span");
span.style.color = "green";
span.style.fontWeight = "bold";

surroundSelectedText(span);