diff --git a/js/WikiTextRules.js b/js/WikiTextRules.js
index 636724516..4fe54ee19 100755
--- a/js/WikiTextRules.js
+++ b/js/WikiTextRules.js
@@ -400,9 +400,10 @@ var rules = [
 {
 	name: "typedBlock",
 	match: "^\\$\\$\\$(?:.*)\\n",
-	lookaheadRegExp: /^\$\$\$(.*)\n((?:.|\n)*?)\$\$\$/mg,
+	lookaheadRegExp: /^\$\$\$(.*)\n((?:^[^\n]*\n)+?)(^\f*\$\$\$$\n?)/mg,
 	handler: function(w)
 	{
+		this.lookaheadRegExp.lastIndex = w.matchStart;
 		var lookaheadMatch = this.lookaheadRegExp.exec(w.source);
 		if(lookaheadMatch && lookaheadMatch.index == w.matchStart) {
 			// The wikitext parsing infrastructure is horribly unre-entrant
diff --git a/tiddlywiki5/tiddlers/TypedBlockTests.tid b/tiddlywiki5/tiddlers/TypedBlockTests.tid
index cd819bd11..e4b408940 100644
--- a/tiddlywiki5/tiddlers/TypedBlockTests.tid
+++ b/tiddlywiki5/tiddlers/TypedBlockTests.tid
@@ -1,11 +1,31 @@
 title: TypedBlockTests
 
-Here's an example of a typed block containing JavaScript source code:
-$$$.js
-return 2+2;
+WikiText can include blocks of text that are rendered with an explicit MIME type like this:
+{{{
+$$$application/javascript
+//This is some JavaScript
+return 2 + "one";
+$$$
+}}}
+This renders as:
+
+$$$application/javascript
+//This is some JavaScript
+return 2 + "one";
 $$$
 
-Here's an example of a typed block containing an SVG image:
+It is also possible to abbreviate the MIME type to a file extension. For example:
+
+{{{
+$$$.svg
+<svg xmlns="http://www.w3.org/2000/svg" width="150" height="100">
+  <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />
+</svg>
+$$$
+}}}
+
+This renders as:
+
 $$$image/svg+xml
 <svg xmlns="http://www.w3.org/2000/svg" width="150" height="100">
   <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />