Dhi

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This Dhi object demo page shows:

• Usage of an eXportable that is pre-initialized with a Dhi
  — see eXportables definition in the python source for the
  Specials Types Directory, and compare
  the initial Dhi there with the final Dhi, displayed below,
  that this page is rendered with.
• Usage of how the page adds to the various attributes of the Dhi
  — see content sub-template for this page.
• Usage of how other objects participate to building up the Dhi
  — see the site template that adds a Collapsable Gizmo object for
  displaying the content sub-template for this page.
• Sample usage of the infrequently used
  meta and http-equiv attributes.
• How the Dhi controls the generation of the HEAD element.
• How the Dhi guarantees that a DHTML document has at most
  one <script> and at most one <style> element
  inlined within the document HEAD.
• How the Dhi elmininates the need of any <script> or
  <style> tags interspersed within the document BODY.

The Dhi, in the state that it is in at this stage of page
processing, is displayed here. Notice that as the
Collapsable Gizmo that the page template renders later
does not yet show up — but this is OK as the Dhi, and the HEAD
element, are always rendered last, meaning that the Dhi for a page
may be added to until the very end of content rendering.