jquery-mathml

gistfile1.js

        convertMath = function (node) {
            try {
                if (node.nodeType == 1) {

                    var newnode = document.createElementNS("http://www.w3.org/1998/Math/MathML", node.nodeName.toLowerCase());

                    for (var i = 0; i < node.attributes.length; i++)
                    newnode.setAttribute(node.attributes[i].nodeName, node.attributes[i].nodeValue);

                    for (var i = 0; i < node.childNodes.length; i++) {
                        var st = node.childNodes[i].nodeValue;
                        if (st == null || st.slice(0, 1) != " " && st.slice(0, 1) != "\n") newnode.appendChild(this.convertMath(node.childNodes[i]));
                    }
                    return newnode;
                } else {
                    return node;
                }
            } catch (e) {}
        }

        replaceWith: function (value) {
            if (this[0] && this[0].parentNode) {
                // Make sure that the elements are removed from the DOM before they are inserted
                // this can help fix replacing a parent with child elements
                if (jQuery.isFunction(value)) {
                    return this.each(function (i) {
                        var self = jQuery(this),
                            old = self.html();
                        self.replaceWith(value.call(this, i, old));
                    });
                }

                if ((typeof value !== "string")) {
                    if (!this.isMath()) {
                        value = jQuery(value).detach();
                    }
                }

                return this.each(function () {
                    var next = this.nextSibling,
                        parent = this.parentNode;

                    // Graft MathML XML
                    if (this.namespaceURI.indexOf("MathML") > -1) {

                        mathmlfrag = (new DOMParser()).parseFromString(value, 'text/xml');

                        if (mathmlfrag.documentElement.nodeName=="parsererror") {
                            var errs = mathmlfrag.documentElement.childNodes[0].nodeValue;
                            errs = errs.replace(/</g, "&lt;");
                            console.log(errs);
                        }

                        newml = convertMath(mathmlfrag.childNodes[0]);

                        parent.replaceChild(newml, this);
                        return newml;
                    }

                    jQuery(this).remove();

                    if (next) {
                        jQuery(next).before(value);
                    } else {
                        jQuery(parent).append(value);
                    }
                });
            } else {
                return this.pushStack(jQuery(jQuery.isFunction(value) ? value() : value), "replaceWith", value);
            }
        },

vanilla jquery

	replaceWith: function( value ) {
		if ( this[0] && this[0].parentNode ) {
			// Make sure that the elements are removed from the DOM before they are inserted
			// this can help fix replacing a parent with child elements
			if ( jQuery.isFunction( value ) ) {
				return this.each(function(i) {
					var self = jQuery(this), old = self.html();
					self.replaceWith( value.call( this, i, old ) );
				});
			}

			if ( typeof value !== "string" ) {
				value = jQuery( value ).detach();
			}

			return this.each(function() {
				var next = this.nextSibling,
					parent = this.parentNode;

				jQuery( this ).remove();

				if ( next ) {
					jQuery(next).before( value );
				} else {
					jQuery(parent).append( value );
				}
			});
		} else {
			return this.pushStack( jQuery(jQuery.isFunction(value) ? value() : value), "replaceWith", value );
		}
	},