--- a/dom/webidl/WebGL2RenderingContext.webidl
+++ b/dom/webidl/WebGL2RenderingContext.webidl
@@ -316,16 +316,24 @@ interface WebGL2RenderingContext : WebGL
     const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;
 
     /* Buffer objects */
     void copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset,
                            GLintptr writeOffset, GLsizeiptr size);
     void getBufferSubData(GLenum target, GLintptr offset, ArrayBuffer? returnedData);
     void getBufferSubData(GLenum target, GLintptr offset, SharedArrayBuffer returnedData);
 
+    [Throws] /* Throws on readback in a write-only context. */
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
+                    GLenum type, GLintptr offset);
+    /* Include our WebGL 1 function override(s) */
+    [Throws]
+    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
+                    GLenum type, ArrayBufferView? pixels);
+
     /* Framebuffer objects */
     void blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0,
                          GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
     void framebufferTextureLayer(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level, GLint layer);
 
     [Throws]
     void invalidateFramebuffer(GLenum target, sequence<GLenum> attachments);