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Balise XHTML optgroup

CSS

  id          ID             #IMPLIED
  class       CDATA          #IMPLIED
  style       %StyleSheet;   #IMPLIED
  title       %Text;         #IMPLIED
  lang        %LanguageCode; #IMPLIED
  xml:lang    %LanguageCode; #IMPLIED
  dir         (ltr|rtl)      #IMPLIED
  onclick     %Script;       #IMPLIED
  ondblclick  %Script;       #IMPLIED
  onmousedown %Script;       #IMPLIED
  onmouseup   %Script;       #IMPLIED
  onmouseover %Script;       #IMPLIED
  onmousemove %Script;       #IMPLIED
  onmouseout  %Script;       #IMPLIED
  onkeypress  %Script;       #IMPLIED
  onkeydown   %Script;       #IMPLIED
  onkeyup     %Script;       #IMPLIED
  disabled    (disabled)     #IMPLIED
  label       %Text;         #REQUIRED

Imbrication XHTML 1.0 Strict

Peut être imbriquée à l'intérieur de:
select
Peut imbriquer:
option // 1 ou plusieurs