Add regression test for #24.
diff --git a/test/coverage.txt b/test/coverage.txt
index 2a1be58..7a0ec5a 100644
--- a/test/coverage.txt
+++ b/test/coverage.txt
@@ -110,6 +110,13 @@ a*b**c*
````````````````````````````````
+### [Issue 24](https://github.com/mity/md4c/issues/24)
+```````````````````````````````` example
+[a](<b>c)
+.
+<p><a href="%3Cb%3Ec">a</a></p>
+````````````````````````````````
+
## Code coverage