From 2efd532563aaaf7162a3cf43ff17ebad48f482cd Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Wed, 1 Mar 2017 18:02:23 -0500
Subject: [PATCH] better error for unmatched closing tag (#321)

---
 src/parse/state/tag.js                             | 2 ++
 test/parser/error-unmatched-closing-tag/error.json | 8 ++++++++
 test/parser/error-unmatched-closing-tag/input.html | 1 +
 3 files changed, 11 insertions(+)
 create mode 100644 test/parser/error-unmatched-closing-tag/error.json
 create mode 100644 test/parser/error-unmatched-closing-tag/input.html

diff --git a/src/parse/state/tag.js b/src/parse/state/tag.js
index 3b79ad8406..11177514b5 100644
--- a/src/parse/state/tag.js
+++ b/src/parse/state/tag.js
@@ -90,6 +90,8 @@ export default function tag ( parser ) {
 
 		// close any elements that don't have their own closing tags, e.g. <div><p></div>
 		while ( parent.name !== name ) {
+			if ( parent.type !== 'Element' ) parser.error( `</${name}> attempted to close an element that was not open`, start );
+
 			parent.end = start;
 			parser.stack.pop();
 
diff --git a/test/parser/error-unmatched-closing-tag/error.json b/test/parser/error-unmatched-closing-tag/error.json
new file mode 100644
index 0000000000..3dd72b28da
--- /dev/null
+++ b/test/parser/error-unmatched-closing-tag/error.json
@@ -0,0 +1,8 @@
+{
+	"message": "</div> attempted to close an element that was not open",
+	"loc": {
+		"line": 1,
+		"column": 0
+	},
+	"pos": 0
+}
diff --git a/test/parser/error-unmatched-closing-tag/input.html b/test/parser/error-unmatched-closing-tag/input.html
new file mode 100644
index 0000000000..7f5eaa32ef
--- /dev/null
+++ b/test/parser/error-unmatched-closing-tag/input.html
@@ -0,0 +1 @@
+</div>
\ No newline at end of file