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+<!--
+Copyright (c) 2023 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.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>Ensure 10bpc image is not crushed to 8bpc in texImage2D</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css" />
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<canvas id="example" width="24" height="24"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description(document.title);
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example", undefined, 2);
+var uniquePixels;
+
+// This is an 8x1, 10-bit-per-channel PNG (encoded as 16bpc).
+// The first pixel is black, and each next pixel is one brighter; approximately:
+// (0/1023,0,0), (1/1023,0,0), (2/1023,0,0), ..., (7/1023,0,0)
+const imgW = 8, imgH = 1;
+const imgURL = "../../../resources/red-gradient-8x1-10bit-untagged.png";
+
+const img = document.createElement("img");
+img.onload = () => {
+  const tex = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  const level = 0;
+  const internalformat = gl.RGB10_A2;
+  const border = 0;
+  const format = gl.RGBA;
+  const type = gl.UNSIGNED_INT_2_10_10_10_REV;
+  gl.texImage2D(gl.TEXTURE_2D, level, internalformat, imgW, imgH, border, format, type, img);
+
+  const fbo = gl.createFramebuffer();
+  gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
+  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
+
+  shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
+
+  const pixels = new Uint32Array(imgW * imgH);
+  gl.readPixels(0, 0, imgW, imgH, format, type, pixels);
+  uniquePixels = new Set(pixels);
+  // If the image was crushed to 8bpc, there will be 2-3 distinct values:
+  // (0/255,0,0), (1/255,0,0), and maybe (2/255,0,0) (depending on truncation vs rounding).
+  // If it wasn't, there should be 7-8.
+  // At time of writing, on Mac M1, Chrome gets 2 if it's crushed, and 7 if it's not.
+  shouldBeGreaterThanOrEqual("uniquePixels.size", "7", "there should be at least 7 distinct color values");
+
+  finishTest();
+};
+img.src = imgURL;
+
+var successfullyParsed = true;
+</script>
+</body>
+</html>