--- a/dom/webidl/WebGL2RenderingContext.webidl
+++ b/dom/webidl/WebGL2RenderingContext.webidl
@@ -574,22 +574,24 @@ interface WebGL2RenderingContext : WebGL
     /* Writing to the drawing buffer */
     void vertexAttribDivisor(GLuint index, GLuint divisor);
     void drawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount);
     void drawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei instanceCount);
     void drawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, GLintptr offset);
 
     /* Multiple Render Targets */
     void drawBuffers(sequence<GLenum> buffers);
-    void clearBufferiv(GLenum buffer, GLint drawbuffer, Int32Array value);
-    void clearBufferiv(GLenum buffer, GLint drawbuffer, sequence<GLint> value);
-    void clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32Array value);
-    void clearBufferuiv(GLenum buffer, GLint drawbuffer, sequence<GLuint> value);
-    void clearBufferfv(GLenum buffer, GLint drawbuffer, Float32Array value);
-    void clearBufferfv(GLenum buffer, GLint drawbuffer, sequence<GLfloat> value);
+
+    void clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values,
+                       optional GLuint srcOffset = 0);
+    void clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values,
+                       optional GLuint srcOffset = 0);
+    void clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values,
+                        optional GLuint srcOffset = 0);
+
     void clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
 
     /* Query Objects */
     WebGLQuery? createQuery();
     void deleteQuery(WebGLQuery? query);
     [WebGLHandlesContextLoss] GLboolean isQuery(WebGLQuery? query);
     void beginQuery(GLenum target, WebGLQuery? query);
     void endQuery(GLenum target);