parseHTML.js

/** 
 * jQuery 2.1.3's parseHTML (without scripts options).
 * Unlike jQuery, this returns a DocumentFragment, which is more convenient to insert into DOM.
 * MIT license.
 * 
 * If you only support Edge 13+ then try this:
    function parseHTML(html, context) {
        var t = (context || document).createElement('template');
            t.innerHTML = html;
        return t.content;
    }
 */
var parseHTML = (function() {
    var rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
        rtagName = /<([\w:]+)/,
        rhtml = /<|&#?\w+;/,
        // We have to close these tags to support XHTML (#13200)
        wrapMap = {
            // Support: IE9
            option: [1, "<select multiple='multiple'>", "</select>"],

            thead: [1, "<table>", "</table>"],
            col: [2, "<table><colgroup>", "</colgroup></table>"],
            tr: [2, "<table><tbody>", "</tbody></table>"],
            td: [3, "<table><tbody><tr>", "</tr></tbody></table>"],

            _default: [0, "", ""]
        };
        
    /**
     * @param {String} elem A string containing html
     * @param {Document} context
     */
    return function parseHTML(elem, context) {
        context = context || document;

        var tmp, tag, wrap, j,
            fragment = context.createDocumentFragment();

        if (!rhtml.test(elem)) {
            fragment.appendChild(context.createTextNode(elem));

            // Convert html into DOM nodes
        } else {
            tmp = fragment.appendChild(context.createElement("div"));

            // Deserialize a standard representation
            tag = (rtagName.exec(elem) || ["", ""])[1].toLowerCase();
            wrap = wrapMap[tag] || wrapMap._default;
            tmp.innerHTML = wrap[1] + elem.replace(rxhtmlTag, "<$1></$2>") + wrap[2];

            // Descend through wrappers to the right content
            j = wrap[0];
            while (j--) {
                tmp = tmp.lastChild;
            }

            // Remove wrappers and append created nodes to fragment
            fragment.removeChild(fragment.firstChild);
            while (tmp.firstChild) {
                fragment.appendChild(tmp.firstChild);
            }
        }

        return fragment;
    };
}());