Add Float16Array-backed ImageData support

[ccameron-chromium]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/ImageData

What specific section or headline is this issue about?

The new pixelFormat attribute allows Float16Array-backed ImageData

What information was incorrect, unhelpful, or incomplete?

A new feature has been added in this PR:
whatwg/html#11143

Shipping support in browsers will come very soon (Chromium will add this extremely soon).

What did you expect to see?

In the ImageData and CanvasRenderingContext2D pages, we need to update:

• ImageData > instance properties: add the pixelFormat property
• ImageData > instance properties > data: Change the description of ImageData.data to indicate that it may be a Float16Array iff pixelFormat is rgba-float16.
• ImageData > Constructor: Add discussion of ImageDataSettings, which can be used to initialize both pixelFormat and colorSpace
• CanvasRenderingContext2D > getImageData > settings, add pixelFormat

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response

[Enemuo1]

Hello, I would like to contribute as well. Is the opportunity still available?