Two simple methods for enabling Drag-n-Drop of SVG images from a CEP Panel to the Illustrator canvas.

DragNDropFromIllustratorPanel.js

/**
 * What is going on here?
 * The Event.dataTransfer object can be set with JavaScript. When the start of a drag event is 
 * detected, we capture the SVG code as a string and set it to the EventTarget.dataTransfer object
 * as a string. Illustrator handles the rest.
 */
/**
 * Add drag start callback. Add this method to the <img/> element like so:
 * 
 *    <img src="path/to/image.svg" onDragStart="onDragStart" />
 */
function onDragStart(event) {
    var filePath = $(event.currentTarget).attr("src");
    event.dataTransfer.setData(
        "text/plain",
        fs.readFileSync(filePath, kUTF_8)
    );
    return true;
}

// ******* OR ******* // 

/**
 * Add drag start callback below to the <svg/> element like so:
 * 
 *    <svg onDragStart="onDrageStart"><path .../></svg>
 */
function onDragStart(event) {
    event.dataTransfer.setData(
        "text/plain",
        $(event.currentTarget).html()
    );
    return true;
}