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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/functions/ivec4_empty_inout_ivec4_array_vert.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/functions/ivec4_empty_inout_ivec4_array_vert.vert
new file mode 100644
index 0000000000..27f136927c
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/functions/ivec4_empty_inout_ivec4_array_vert.vert
@@ -0,0 +1,91 @@
+
+/*
+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;
+
+// Function declarations.
+ivec4 function(inout ivec4 par[3]);
+bool is_all(const in ivec4 par, const in int value);
+bool is_all(const in ivec4 array[3], const in ivec4 value);
+void set_all(out ivec4 array[3], const in ivec4 value);
+
+void main (void)
+{
+	ivec4 par[3];
+	ivec4 ret = ivec4(0, 0, 0, 0);
+
+	float gray = 0.0;
+
+	// Initialize the entire array to 1.
+	set_all(par, ivec4(1, 1, 1, 1));
+
+	ret = function(par);
+
+	// The parameter should be changed by the function and the function should return 1.
+	if(is_all(par, ivec4(0, 0, 0, 0)) && is_all(ret, 1))
+	{
+		gray = 1.0;
+	}
+
+	color = vec4(gray, gray, gray, 1.0);
+	gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+}
+
+// Function definitions.
+ivec4 function(inout ivec4 par[3])
+{
+	// Return the value of the array.
+	if(is_all(par, ivec4(1, 1, 1, 1)))
+	{
+		// Test parameter qualifier (default is "in").
+		set_all(par, ivec4(0, 0, 0, 0));
+
+		return ivec4(1, 1, 1, 1);
+	}
+	else
+		return ivec4(0, 0, 0, 0);
+}
+
+bool is_all(const in ivec4 par, const in int value)
+{
+	bool ret = true;
+
+	if(par[0] != value)
+		ret = false;
+	if(par[1] != value)
+		ret = false;
+	if(par[2] != value)
+		ret = false;
+	if(par[3] != value)
+		ret = false;
+
+	return ret;
+}
+
+bool is_all(const in ivec4 array[3], const in ivec4 value)
+{
+	bool ret = true;
+
+	if(array[0] != value)
+		ret = false;
+	if(array[1] != value)
+		ret = false;
+	if(array[2] != value)
+		ret = false;
+
+	return ret;
+}
+
+void set_all(out ivec4 array[3], const in ivec4 value)
+{
+	array[0] = value;
+	array[1] = value;
+	array[2] = value;
+}