From 07b1724794bb65a5a64e33712ce9029319377a1f Mon Sep 17 00:00:00 2001
From: facelessuser <faceless.shop@gmail.com>
Date: Thu, 16 Nov 2017 19:13:57 -0700
Subject: Lowercase tags when initially building the list

---
 markdown/treeprocessors.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/markdown/treeprocessors.py b/markdown/treeprocessors.py
index 3bc4013..2732923 100644
--- a/markdown/treeprocessors.py
+++ b/markdown/treeprocessors.py
@@ -275,11 +275,11 @@ class InlineProcessor(Treeprocessor):
 
         ancestors = []
         parent_map = dict((c, p) for p in parent.getiterator() for c in p)
-        ancestors.append(parent.tag)
+        ancestors.append(parent.tag.lower())
         while parent:
             parent = parent_map.get(parent)
             if parent:
-                ancestors.append(parent.tag)
+                ancestors.append(parent.tag.lower())
         return list(reversed(ancestors))
 
     def run(self, tree):
-- 
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