Add fenced code block example with not enough backticks.

1 files changed, 9 insertions, 0 deletions

diff --git a/spec.txt b/spec.txt
index 8353a5f..90efd0d 100644
--- a/spec.txt
+++ b/spec.txt
@@ -1645,6 +1645,15 @@ With tildes:
 </code></pre>
 ````````````````````````````````
 
+Fewer than three backticks is not enough:
+
+```````````````````````````````` example
+``
+foo
+``
+.
+<p><code>foo</code></p>
+````````````````````````````````
 
 The closing code fence must use the same character as the opening
 fence: