From 34c3f78535608d7cdd3061756088308561891764 Mon Sep 17 00:00:00 2001
From: Jon Newmuis <newmuis@users.noreply.github.com>
Date: Fri, 8 May 2020 15:35:50 -0400
Subject: [PATCH] Check for CSS variable support (#28256)

* Check for CSS variable support

* Update extensions/amp-story/1.0/amp-story.js

Co-authored-by: Gabriel Majoulet <gmajoulet@gmail.com>

Co-authored-by: Gabriel Majoulet <gmajoulet@gmail.com>
---
 extensions/amp-story/1.0/amp-story.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/extensions/amp-story/1.0/amp-story.js b/extensions/amp-story/1.0/amp-story.js
index c0ef90ea243b..7c0cd96921e5 100644
--- a/extensions/amp-story/1.0/amp-story.js
+++ b/extensions/amp-story/1.0/amp-story.js
@@ -2783,7 +2783,10 @@ export class AmpStory extends AMP.BaseElement {
    */
   static isBrowserSupported(win) {
     return Boolean(
-      win.CSS && win.CSS.supports && win.CSS.supports('display', 'grid')
+      win.CSS &&
+        win.CSS.supports &&
+        win.CSS.supports('display', 'grid') &&
+        win.CSS.supports('color', 'var(--test)')
     );
   }
 }