diff --git a/components/script/dom/webidls/WebGLRenderingContext.webidl b/components/script/dom/webidls/WebGLRenderingContext.webidl
index d36154c7355..2ad85964e5a 100644
--- a/components/script/dom/webidls/WebGLRenderingContext.webidl
+++ b/components/script/dom/webidls/WebGLRenderingContext.webidl
@@ -421,7 +421,8 @@ interface WebGLRenderingContextBase
     const GLenum RGB5_A1                        = 0x8057;
     const GLenum RGB565                         = 0x8D62;
     const GLenum DEPTH_COMPONENT16              = 0x81A5;
-    const GLenum STENCIL_INDEX                  = 0x1901;
+    // https://github.com/KhronosGroup/WebGL/pull/2371
+    // const GLenum STENCIL_INDEX                  = 0x1901;
     const GLenum STENCIL_INDEX8                 = 0x8D48;
     const GLenum DEPTH_STENCIL                  = 0x84F9;
 
diff --git a/tests/wpt/webgl/meta/conformance/context/constants-and-properties.html.ini b/tests/wpt/webgl/meta/conformance/context/constants-and-properties.html.ini
deleted file mode 100644
index 49434267629..00000000000
--- a/tests/wpt/webgl/meta/conformance/context/constants-and-properties.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[constants-and-properties.html]
-  [WebGL test #2: Also found the following extra properties:]
-    expected: FAIL
-
-  [WebGL test #3: STENCIL_INDEX]
-    expected: FAIL
-