update elements and fix some bugs

lib/src/prism/tests/languages/markdown/title_feature.test

Index: lib/src/prism/tests/languages/markdown/title_feature.test
diff --git a/lib/src/prism/tests/languages/markdown/title_feature.test b/lib/src/prism/tests/languages/markdown/title_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..e02e86fb7b419eb3bd65f1bfc902a7c1b780d4b7
--- /dev/null
+++ b/lib/src/prism/tests/languages/markdown/title_feature.test
@@ -0,0 +1,34 @@
+title 1
+==
+
+foobar
+======
+
+title 2
+--
+
+# title 1
+## title 2
+### title 3
+#### title 4
+##### title 5
+###### title 6
+
+----------------------------------------------------
+
+[
+	["title", ["title 1\r\n", ["punctuation", "=="]]],
+	["title", ["foobar\r\n", ["punctuation", "======"]]],
+	["title", ["title 2\r\n", ["punctuation", "--"]]],
+
+	["title", [["punctuation", "#"], " title 1"]],
+	["title", [["punctuation", "##"], " title 2"]],
+	["title", [["punctuation", "###"], " title 3"]],
+	["title", [["punctuation", "####"], " title 4"]],
+	["title", [["punctuation", "#####"], " title 5"]],
+	["title", [["punctuation", "######"], " title 6"]]
+]
+
+----------------------------------------------------
+
+Checks for titles.