* works for ASCII. So for now, assume any non-ASCII characters are valid. The only place this
     * seems to be documented is here:
     * https://groups.google.com/d/topic/google-web-toolkit-contributors/1UEzsryq1XI
     *
     * <p>ASCII characters in the part are expected to be valid per RFC 1035, with underscore also
     * being allowed due to widespread practice.
     */

  /**
   * The HTTP <a href="https://patcg-individual-drafts.github.io/topics/">{@code
   * Sec-Browsing-Topics}</a> header field name.
   *
   * @since 32.0.0
   */
  public static final String SEC_BROWSING_TOPICS = "Sec-Browsing-Topics";
  /**
   * The HTTP <a href="https://patcg-individual-drafts.github.io/topics/">{@code
   * Observe-Browsing-Topics}</a> header field name.
   *
   * @since 32.0.0
   */