sanitiseHTML(html) {
    if (!_a.win["DOMPurify"]) return html;
    return _a.win["DOMPurify"].sanitize(html, { ADD_TAGS: this.sanitiseExtraTags, ADD_ATTR: this.sanitiseExtraAttribs });
  }
Sanitise HTML to make it safe - if the DOMPurify library is loaded
Otherwise just returns that HTML as-is.
@param {string} html The input HTML string
@returns {string} The sanitised HTML or the original if DOMPurify not loaded