function linkifyURL(url)
        {
            var hrefUrl = url;
            var match = hrefUrl.match(/['"]?([^'"]+)/);
            if (match)
                hrefUrl = match[1];
            var container = createDocumentFragment();
            container.createTextChild("url(");
            if (this._styleRule.rule() && this._styleRule.rule().resourceURL())
                hrefUrl = WebInspector.ParsedURL.completeURL(this._styleRule.rule().resourceURL(), hrefUrl);
            else if (this.node())
                hrefUrl = this.node().resolveURL(hrefUrl);
            var hasResource = hrefUrl && !!WebInspector.resourceForURL(hrefUrl);
            // FIXME: WebInspector.linkifyURLAsNode() should really use baseURI.
            container.appendChild(WebInspector.linkifyURLAsNode(hrefUrl || url, url, undefined, !hasResource));
            container.createTextChild(")");
            return container;
        }
@param {string} url
@return {!Node}
@this {WebInspector.StylePropertyTreeElementBase}