From ea5ee95dbec689953c35fa552e1170061a8a945d Mon Sep 17 00:00:00 2001
From: Emily Eisenberg <emily@khanacademy.org>
Date: Wed, 17 Sep 2014 15:13:56 -0700
Subject: [PATCH] Warn when the website is in quirks mode

Summary:
KaTeX doesn't work correctly in quirks mode. Warn in the console and disable
rendering if that happens.

Test Plan:
 - Make sure the test still loads and renders math
 - Make sure a warning is thrown when the doctype is removed, and no more math
   is rendered
 - Make sure the tests pass both on the web and with `make test`

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D13192
---
 katex.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/katex.js b/katex.js
index 706a717..b6b96f3 100644
--- a/katex.js
+++ b/katex.js
@@ -25,6 +25,20 @@ var render = function(toParse, baseNode) {
     baseNode.appendChild(node);
 };
 
+// KaTeX's styles don't work properly in quirks mode. Print out an error, and
+// disable rendering.
+if (typeof document !== "undefined") {
+    if (document.compatMode !== "CSS1Compat") {
+        typeof console !== "undefined" && console.warn(
+            "Warning: KaTeX doesn't work in quirks mode. Make sure your " +
+                "website has a suitable doctype.");
+
+        render = function() {
+            throw new ParseError("KaTeX doesn't work in quirks mode.");
+        };
+    }
+}
+
 /**
  * Parse and build an expression, and return the markup for that.
  */