From c3fba5b0c28751cd0a51d1154e922b134c25254e Mon Sep 17 00:00:00 2001
From: Gregg Tavares <github@greggman.com>
Date: Tue, 23 Apr 2019 22:38:29 +0200
Subject: [PATCH 1/2] remove experimental-webgl2

experimental-webgl2 has never existed nor is it part of any specs
---
 webglreport.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/webglreport.js b/webglreport.js
index e46542f..3d77add 100644
--- a/webglreport.js
+++ b/webglreport.js
@@ -27,7 +27,7 @@ $(function() {
 
     var canvas = $('<canvas />', { width: '1', height: '1' }).appendTo('body');
     var gl;
-    var possibleNames = (webglVersion === 2) ? ['webgl2', 'experimental-webgl2'] : ['webgl', 'experimental-webgl'];
+    var possibleNames = (webglVersion === 2) ? ['webgl2'] : ['webgl', 'experimental-webgl'];
     var contextName = _.find(possibleNames, function (name) {
         gl = canvas[0].getContext(name, { stencil: true });
         return !!gl;

From d38bc8edc988f7616bdcdb331c69bca4ca9a80f3 Mon Sep 17 00:00:00 2001
From: Gregg Tavares <github@greggman.com>
Date: Tue, 23 Apr 2019 22:48:19 +0200
Subject: [PATCH 2/2] Add a simple check for invalid implemtentations

---
 index.html     | 12 ++++++++++++
 webglreport.js |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/index.html b/index.html
index 077ab8f..cd76f5d 100644
--- a/index.html
+++ b/index.html
@@ -389,6 +389,18 @@ <h1>Uniform Buffers</h1>
         </div>
     </script>
 
+    <script type="text/template" id="webglBadImplementation">
+        <div class="header">
+            <p>&times; This browser claims to supports WebGL <%= report.webglVersion %>, but it has an invalid or incomplete implementation.</p>
+            <p>
+                Check out <a href="http://get.webgl.org/">Get WebGL</a>,
+                or try installing the latest version of
+                <a href="https://www.google.com/chrome">Chrome</a>, or
+                <a href="https://www.mozilla.org/en-US/firefox/">Firefox</a>.
+            </p>
+        </div>
+    </script>
+
     <script type="text/template" id="webglVersionTabs">
         <div class="webglVersionTabs">
             <a href="?v=1" class="<%= report.webglVersion === 1 ? 'active' : '' %>">WebGL 1</a>
diff --git a/webglreport.js b/webglreport.js
index 3d77add..46940f1 100644
--- a/webglreport.js
+++ b/webglreport.js
@@ -467,6 +467,13 @@ $(function() {
         });
     }
 
+    if (gl.getError()) {
+        // The implementatiion is bad
+        $('#output').addClass('warn');
+        renderReport($('#webglBadImplementation').html());
+        return;
+    }
+
     if (window.externalHost) {
         // Tab is running with Chrome Frame
         renderReport($('#webglSupportedChromeFrameTemplate').html());