http://www.w3.org/1999/xhtml
attributeGroup focus

Documentation

      attributes for elements that can get the focus
      accesskey   accessibility key character
      tabindex    position in tabbing order
      onfocus     the element got the focus
      onblur      the element lost the focus
      

Source

<xs:attributeGroup name="focus">
  <xs:attribute name="accesskey" type="Character"/>
  <xs:attribute name="tabindex" type="tabindexNumber"/>
  <xs:attribute name="onfocus" type="Script"/>
  <xs:attribute name="onblur" type="Script"/>
</xs:attributeGroup>