diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 9f930361ee1..d227af7ea1a 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -653,17 +653,17 @@ impl WebGLRenderingContext {
             (TexFormat::RGBA, TexDataType::UnsignedShort4444) => {
                 for rgba in pixels.chunks_mut(2) {
                     let pix = NativeEndian::read_u16(rgba);
-                    let extend_to_8_bits = |val| { (val | val << 4) as u8 };
-                    let r = extend_to_8_bits(pix & 0x000f);
-                    let g = extend_to_8_bits((pix & 0x00f0) >> 4);
-                    let b = extend_to_8_bits((pix & 0x0f00) >> 8);
-                    let a = extend_to_8_bits((pix & 0xf000) >> 12);
+                    let extend_to_8_bits = |val| (val | val << 4) as u8;
+                    let r = extend_to_8_bits(pix >> 12 & 0x0f);
+                    let g = extend_to_8_bits(pix >> 8 & 0x0f);
+                    let b = extend_to_8_bits(pix >> 4 & 0x0f);
+                    let a = extend_to_8_bits(pix & 0x0f);
                     NativeEndian::write_u16(
                         rgba,
-                        (multiply_u8_pixel(r, a) & 0xf0) as u16 >> 4 |
-                        (multiply_u8_pixel(g, a) & 0xf0) as u16 |
-                        ((multiply_u8_pixel(b, a) & 0xf0) as u16) << 4 |
-                        pix & 0xf000,
+                        ((multiply_u8_pixel(r, a) & 0xf0) as u16) << 8 |
+                        ((multiply_u8_pixel(g, a) & 0xf0) as u16) << 4 |
+                        ((multiply_u8_pixel(b, a) & 0xf0) as u16) |
+                        ((a & 0x0f) as u16),
                     );
                 }
             },
diff --git a/tests/wpt/webgl/meta/conformance/textures/misc/tex-image-with-format-and-type.html.ini b/tests/wpt/webgl/meta/conformance/textures/misc/tex-image-with-format-and-type.html.ini
deleted file mode 100644
index cc7d66b3a16..00000000000
--- a/tests/wpt/webgl/meta/conformance/textures/misc/tex-image-with-format-and-type.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[tex-image-with-format-and-type.html]
-  [WebGL test #65: UNPACK_PREMULTIPLY_ALPHA_WEBGL with RGBA/UNSIGNED_SHORT_4_4_4_4]
-    expected: FAIL
-
-  [WebGL test #69: UNPACK_PREMULTIPLY_ALPHA_WEBGL with RGBA/UNSIGNED_SHORT_4_4_4_4]
-    expected: FAIL
-