commit 9d3f1aa466b2052c780e907cf84b6257ffc91cd1
Author: epriestley <git@epriestley.com>
Date:   Sat Apr 22 09:10:47 2017 -0700

    WIP

diff --git a/src/markup/engine/__tests__/remarkup/percent-block-solo.txt b/src/markup/engine/__tests__/remarkup/percent-block-solo.txt
new file mode 100644
index 0000000..eb9a2ef
--- /dev/null
+++ b/src/markup/engine/__tests__/remarkup/percent-block-solo.txt
@@ -0,0 +1,11 @@
+%%%
+**x**
+%%%
+~~~~~~~~~~
+<p class="remarkup-literal">
+<br />**x**
+<br /></p>
+~~~~~~~~~~
+
+**x**
+
diff --git a/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php b/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
index c1d4a0a..2cb8ee2 100644
--- a/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
+++ b/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
@@ -22,6 +22,13 @@ final class PhutilRemarkupLiteralBlockRule extends PhutilRemarkupBlockRule {
     while (preg_match('/^\s*%%%/', $lines[$cursor])) {
       $num_lines++;
 
+      // If the line has ONLY "%%%", the block opener doesn't get to double
+      // up as a block terminator.
+      if (preg_match('/^\s*%%%\s*\z/', $lines[$cursor])) {
+        $num_lines++;
+        $cursor++;
+      }
+
       while (isset($lines[$cursor])) {
         if (!preg_match('/%%%\s*$/', $lines[$cursor])) {
           $num_lines++;