Add exception info for HTMLCanvasElement.transferControlToOffscreen() and OffscreenCanvas.transferToImageBitmap()

files/en-us/web/api/htmlcanvaselement/getcontext/index.md

@@ -117,7 +117,7 @@ If the context identifier is not supported, or the canvas has already been set t
 ### Exceptions
 
 - `InvalidStateError` {{domxref("DOMException")}}
-  - : Throws if the canvas has transferred its control to offscreen via calling `HTMLCanvasElement.transferControlToOffscreen()`.
+  - : Throws if the canvas has transferred its control to offscreen by calling {{domxref("HTMLCanvasElement.transferControlToOffscreen()")}}.
 
 ## Examples
 

files/en-us/web/api/htmlcanvaselement/transfercontroltooffscreen/index.md

@@ -24,6 +24,11 @@ None.
 
 An {{domxref("OffscreenCanvas")}} object.
 
+### Exceptions
+
+- `InvalidStateError` {{domxref("DOMException")}}
+  - : Throws if the canvas has been set to a context mode by calling {{domxref("HTMLCanvasElement.getContext()")}} or has transferred its control to offscreen by calling {{domxref("HTMLCanvasElement.transferControlToOffscreen()")}}.
+
 ## Examples
 
 The following example shows how to transfer control to an {{domxref("OffscreenCanvas")}} object on the main thread.

files/en-us/web/api/offscreencanvas/transfertoimagebitmap/index.md

@@ -32,6 +32,11 @@ If your goal is to pass the `ImageBitmap` to other web APIs which do not consume
 
 If you call `transferToImageBitmap()` and don't intend to pass it to {{domxref("ImageBitmapRenderingContext.transferFromImageBitmap()")}}, consider whether you need to call `transferToImageBitmap()` at all. Many web APIs which accept `ImageBitmap` also accept `OffscreenCanvas` as an argument.
 
+### Exceptions
+
+- `InvalidStateError` {{domxref("DOMException")}}
+  - : Throws if the canvas has transferred to another context scope, for example, to worker; or hasn't set to a context mode via calling {{domxref("OffscreenCanvas.getContext()")}}.
+
 ## Examples
 
 ```js