In the following, please use lowercase tags (uppercase used for clarity)

  • No DIV allowed in A
    do not write <A><DIV>Hello</DIV></A>
    write instead <A><SPAN>Hello</SPAN></A>
  • No INPUT allowed in FORM
    do not write <FORM><INPUT /></FORM>
    write instead <FORM><DIV><INPUT /></DIV></FORM>