Would support for the details and summary HTML elements be considered for the wiki (and I guess other places that wiki markup is used)?

The following seems to work for me. I gladly turn it over to the fossil project for use.

I find this to be very useful for examples or digressions in documentation. It has only been tested with markdown formatted wiki documents however. So I may be missing something.

Index: src/wikiformat.c
==================================================================
--- src/wikiformat.c
+++ src/wikiformat.c
@@ -195,10 +195,11 @@
   MARKUP_CODE,
   MARKUP_COL,
   MARKUP_COLGROUP,
   MARKUP_DD,
   MARKUP_DEL,
+  MARKUP_DETAILS,
   MARKUP_DFN,
   MARKUP_DIV,
   MARKUP_DL,
   MARKUP_DT,
   MARKUP_EM,
@@ -229,10 +230,11 @@
   MARKUP_SMALL,
   MARKUP_SPAN,
   MARKUP_STRIKE,
   MARKUP_STRONG,
   MARKUP_SUB,
+  MARKUP_SUMMARY,
   MARKUP_SUP,
   MARKUP_TABLE,
   MARKUP_TBODY,
   MARKUP_TD,
   MARKUP_TFOOT,
@@ -303,10 +305,12 @@
                     AMSK_ALIGN|AMSK_CLASS|AMSK_COLSPAN|AMSK_WIDTH|AMSK_STYLE },
  { "colgroup",      MARKUP_COLGROUP,     MUTYPE_BLOCK,
                     AMSK_ALIGN|AMSK_CLASS|AMSK_COLSPAN|AMSK_WIDTH|AMSK_STYLE},
  { "dd",            MARKUP_DD,           MUTYPE_LI,            AMSK_STYLE },
  { "del",           MARKUP_DEL,          MUTYPE_FONT,          AMSK_STYLE },
+ { "details",       MARKUP_DETAILS,      MUTYPE_BLOCK,
+                    AMSK_ID|AMSK_CLASS|AMSK_STYLE },
  { "dfn",           MARKUP_DFN,          MUTYPE_FONT,          AMSK_STYLE },
  { "div",           MARKUP_DIV,          MUTYPE_BLOCK,
                     AMSK_ID|AMSK_CLASS|AMSK_STYLE },
  { "dl",            MARKUP_DL,           MUTYPE_LIST,
                     AMSK_COMPACT|AMSK_STYLE },
@@ -361,10 +365,12 @@
  { "span",          MARKUP_SPAN,         MUTYPE_BLOCK,
                     AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
  { "strike",        MARKUP_STRIKE,       MUTYPE_FONT,          AMSK_STYLE },
  { "strong",        MARKUP_STRONG,       MUTYPE_FONT,          AMSK_STYLE },
  { "sub",           MARKUP_SUB,          MUTYPE_FONT,          AMSK_STYLE },
+ { "summary",       MARKUP_SUMMARY,      MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
  { "sup",           MARKUP_SUP,          MUTYPE_FONT,          AMSK_STYLE },
  { "table",         MARKUP_TABLE,        MUTYPE_TABLE,
                     AMSK_ALIGN|AMSK_BGCOLOR|AMSK_BORDER|AMSK_CELLPADDING|
                     AMSK_CELLSPACING|AMSK_HSPACE|AMSK_VSPACE|AMSK_CLASS|
                     AMSK_STYLE  },