add documentation

Documentation-develop/HTML.md

@@ -70,6 +70,14 @@ Use with LDAP: `typeAheadLdap`
 
 * If present, only suggested values are allowed in the input element
 
+### .data-typeahead-tag-static-list
+
+* JSON encoded list of suggestions, which are served with the HTML input element.
+* If both this list and the attribute `data-typeahead-sip` are given, then the typeahead
+suggestions are taken from both sources.
+* Expected JSON example:
+
+  `[{value: "Alaska", key: "AK"}, {value: "Alabama", key: "AL"}]`
 
 ## Tags Form Element