[css-anchor-position-1][editorial] Wrap example iframe in a figure, link to source

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -976,7 +976,10 @@ etc.
 	and see that the anchored lines and tooltips dynamically adjust
 	to whichever bar is the highest/lowest.
 
-	<iframe src="examples/calc-anchor.html" style="width: 80%; aspect-ratio: 5 / 3; margin: 1em 10%;"></iframe>
+	<figure>
+		<iframe src="examples/calc-anchor.html" style="width: 80%; aspect-ratio: 5 / 3; margin: 1em 10%;"></iframe>
+		<figcaption><a href="examples/calc-anchor.html">Full Example</a></figcaption>
+	</figure>
 
 	The important fragment of the code to accomplish this is: