handleHref(event, item, href) {
      this._loader.sanitize(href, {
        context: 'href'
      }).then(opt => {
        const e = new MouseEvent(event.type, event),
          a = domCreate(null, 'a');
        for (const name in opt) a.setAttribute(name, opt[name]);
        a.dispatchEvent(e);
      }).catch(() => {});
    }
Handle hyperlink navigation in response to an item.href value.
@param {Event} event - The event triggering hyperlink navigation.
@param {Item} item - The scenegraph item.
@param {string} href - The URL to navigate to.