diff --git a/Makefile b/Makefile
index 6a66b5a..73114a6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,8 @@
-.PHONY: gen gen-check doc
+.PHONY: help gen gen-check doc
+
+# default target if you just type `make`
+help:
+	@echo 'Targets are: help, fix, gen, gen-check, doc'
 
 fix: webgpu.yml
 	go run ./fix -yaml webgpu.yml
diff --git a/webgpu.h b/webgpu.h
index aba280f..9e62c84 100644
--- a/webgpu.h
+++ b/webgpu.h
@@ -160,7 +160,6 @@ struct WGPUSurfaceCapabilities;
 struct WGPUSurfaceConfiguration;
 struct WGPUSurfaceDescriptor;
 struct WGPUSurfaceSourceAndroidNativeWindow;
-struct WGPUSurfaceSourceCanvasHTMLSelector_Emscripten;
 struct WGPUSurfaceSourceMetalLayer;
 struct WGPUSurfaceSourceWaylandSurface;
 struct WGPUSurfaceSourceWindowsHWND;
@@ -588,16 +587,15 @@ typedef enum WGPURequestDeviceStatus {
 
 typedef enum WGPUSType {
     WGPUSType_Invalid = 0x00000000,
-    WGPUSType_SurfaceSourceMetalLayer = 0x00000001,
-    WGPUSType_SurfaceSourceWindowsHWND = 0x00000002,
-    WGPUSType_SurfaceSourceXlibWindow = 0x00000003,
-    WGPUSType_SurfaceSourceCanvasHTMLSelector_Emscripten = 0x00000004,
-    WGPUSType_ShaderSourceSPIRV = 0x00000005,
-    WGPUSType_ShaderSourceWGSL = 0x00000006,
+    WGPUSType_ShaderSourceSPIRV = 0x00000001,
+    WGPUSType_ShaderSourceWGSL = 0x00000002,
+    WGPUSType_RenderPassMaxDrawCount = 0x00000003,
+    WGPUSType_SurfaceSourceMetalLayer = 0x00000004,
+    WGPUSType_SurfaceSourceWindowsHWND = 0x00000005,
+    WGPUSType_SurfaceSourceXlibWindow = 0x00000006,
     WGPUSType_SurfaceSourceWaylandSurface = 0x00000007,
     WGPUSType_SurfaceSourceAndroidNativeWindow = 0x00000008,
     WGPUSType_SurfaceSourceXCBWindow = 0x00000009,
-    WGPUSType_RenderPassMaxDrawCount = 0x0000000F,
     WGPUSType_Force32 = 0x7FFFFFFF
 } WGPUSType WGPU_ENUM_ATTRIBUTE;
 
@@ -1467,18 +1465,6 @@ typedef struct WGPUSurfaceSourceAndroidNativeWindow {
     void * window;
 } WGPUSurfaceSourceAndroidNativeWindow WGPU_STRUCTURE_ATTRIBUTE;
 
-/**
- * Chained in @ref WGPUSurfaceDescriptor to make an @ref WGPUSurface wrapping an [HTML `<canvas>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas).
- */
-typedef struct WGPUSurfaceSourceCanvasHTMLSelector_Emscripten {
-    WGPUChainedStruct chain;
-    /**
-     * The [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_selectors) for the `<canvas>` element that will be wrapped by the @ref WGPUSurface.
-     * Most commonly `"#id_of_the_canvas"`.
-     */
-    char const * selector;
-} WGPUSurfaceSourceCanvasHTMLSelector_Emscripten WGPU_STRUCTURE_ATTRIBUTE;
-
 /**
  * Chained in @ref WGPUSurfaceDescriptor to make an @ref WGPUSurface wrapping a [`CAMetalLayer`](https://developer.apple.com/documentation/quartzcore/cametallayer?language=objc).
  */
diff --git a/webgpu.yml b/webgpu.yml
index e67f358..a845d9b 100644
--- a/webgpu.yml
+++ b/webgpu.yml
@@ -717,22 +717,23 @@ enums:
       - name: invalid
         doc: |
           TODO
-      - name: surface_source_metal_layer
+      - name: shader_source_SPIRV
         doc: |
           TODO
-      - name: surface_source_windows_HWND
+      - name: shader_source_WGSL
         doc: |
           TODO
-      - name: surface_source_xlib_window
+      - name: render_pass_max_draw_count
         doc: |
           TODO
-      - name: surface_source_canvas_HTML_selector__Emscripten
+      # TODO(#214): Move all of the surface sources into block 0x0001
+      - name: surface_source_metal_layer
         doc: |
           TODO
-      - name: shader_source_SPIRV
+      - name: surface_source_windows_HWND
         doc: |
           TODO
-      - name: shader_source_WGSL
+      - name: surface_source_xlib_window
         doc: |
           TODO
       - name: surface_source_wayland_surface
@@ -744,10 +745,6 @@ enums:
       - name: surface_source_XCB_window
         doc: |
           TODO
-      - name: render_pass_max_draw_count
-        value: 0x000F
-        doc: |
-          TODO
   - name: sampler_binding_type
     doc: |
       TODO
@@ -2765,17 +2762,6 @@ structs:
         doc: The pointer to the [`ANativeWindow`](https://developer.android.com/ndk/reference/group/a-native-window) that will be wrapped by the @ref WGPUSurface.
         type: c_void
         pointer: mutable
-  - name: surface_source_canvas_HTML_selector__Emscripten
-    doc: Chained in @ref WGPUSurfaceDescriptor to make an @ref WGPUSurface wrapping an [HTML `<canvas>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas).
-    type: extension_in
-    extends:
-      - surface_descriptor
-    members:
-      - name: selector
-        doc: |
-          The [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_selectors) for the `<canvas>` element that will be wrapped by the @ref WGPUSurface.
-          Most commonly `"#id_of_the_canvas"`.
-        type: string
   - name: surface_source_metal_layer
     doc: Chained in @ref WGPUSurfaceDescriptor to make an @ref WGPUSurface wrapping a [`CAMetalLayer`](https://developer.apple.com/documentation/quartzcore/cametallayer?language=objc).
     type: extension_in