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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat/mat2_vert.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat/mat2_vert.vert
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/mat/mat2_vert.vert
@@ -0,0 +1,52 @@
+
+/*
+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;
+varying vec4 color;
+
+#define ERROR_EPSILON 0.1
+
+void main (void)
+{
+ float x;
+ // Declare a 2 by 2 matrix with unique elements.
+ mat2 a = mat2(1.0, 2.0, // 1.0 4.0
+ 4.0, 8.0); // 2.0 8.0
+
+ // Check each element.
+ bool elms = true;
+ if(a[0][0] != 1.0) elms = false;
+ if(a[0][1] != 2.0) elms = false;
+ if(a[1][0] != 4.0) elms = false;
+ if(a[1][1] != 8.0) elms = false;
+
+ // Add up each row.
+ bool rows = true;
+ x = a[0][0] + a[1][0];
+ if(x < 5.0-ERROR_EPSILON || x > 5.0+ERROR_EPSILON) rows = false;
+ x = a[0][1] + a[1][1];
+ if(x < 10.0-ERROR_EPSILON || x > 10.0+ERROR_EPSILON) rows = false;
+
+ // Add up each column.
+ bool cols = true;
+ x = a[0][0] + a[0][1];
+ if(x < 3.0-ERROR_EPSILON || x > 3.0+ERROR_EPSILON) cols = false;
+ x = a[1][0] + a[1][1];
+ if(x < 12.0-ERROR_EPSILON || x > 12.0+ERROR_EPSILON) cols = false;
+
+ // Check if all of the operations were successful.
+ float gray = elms && rows && cols ? 1.0 : 0.0;
+
+ // Assign the varying variable color.
+ color = vec4(gray, gray, gray, 1.0);
+
+ // Transform the vertex position.
+ gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+}
+