setContent(element, content, forceSanitize, sanitizeOptions) {
    if (element instanceof HTMLElement) {
      element.innerHTML = this.sanitize(content, forceSanitize, sanitizeOptions);
      return true;
    }
    return false;
  }
Sets the content, innerHTML, of an element to the sanitized content.
@param {HTMLElement} element - The element to set the innerHTML to.
@param {string} content - The HTML string content that we wish to set.
@param {boolean} forceSanitize - If we should force the content to be sanitized.
@param {any} sanitizeOptions - The options for the sanitize function.
@returns {boolean} - TRUE if the content was sanitized and set.