ตรวจสอบเพจ ตามมาตรฐาน XHTML

  <p>
    <a href="http://validator.w3.org/check?uri=referer"><img
        src="http://www.w3.org/Icons/valid-xhtml10"
        alt="Valid XHTML 1.0 Transitional" height="31" width="88" /></a>
  </p>
  

  <p>
    <a href="http://validator.w3.org/check?uri=referer"><img
        src="http://www.w3.org/Icons/valid-xhtml10-blue"
        alt="Valid XHTML 1.0 Transitional" height="31" width="88" /></a>
  </p>