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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat3/mat3arraysimple_vert.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat3/mat3arraysimple_vert.vert
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index 0000000000..b05e52a9a4
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat3/mat3arraysimple_vert.vert
@@ -0,0 +1,32 @@
+
+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+
+
+attribute vec4 gtf_Vertex;
+uniform mat4 gtf_ModelViewProjectionMatrix;
+//
+// mat3arraysimple_vert.vert: Vertex shader solid color testing indirect referencing into uniforms
+// The vec3 values are determined at runtime.
+//
+//
+
+uniform mat3 testmat3[2];
+varying vec4 color;
+
+
+void main(void)
+{
+ vec3 result = vec3(0.0, 0.0, 0.0);
+
+ result = testmat3[1][0] + testmat3[1][1] + testmat3[1][2];
+
+ color = vec4(result/2.0, 0.5);
+
+ gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+
+
+}