[cssom-view] Expose video plane pixel ratio
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Description
Discussion started in https://github.com/w3c/csswg-drafts/issues/5044. The main idea is to expose the device pixel ratio for <video>, allowing authors to select an optimal content resolution. UAs on TV's and dongles will often have a distinct video "plane" with a higher device pixel ratio than reported by window.devicePixelRatio.
I propose adding deviceVideoPixelRatio to Screen. Authors can then determine the "video" pixels of anything, including screen (width, height), window (availWidth, availHeigh), as well as inline. For example:
full screen case
targetResolution = screen.width * window.deviceVideoPixelRatio;
inline case
targetResolution = element.clientWidth * window.deviceVideoPixelRatio;
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked CSSWG discussion and the CSSOM View Screen interface described in the issue. Determine the agreed shape and behavior for exposing video-plane pixel ratio, then update the relevant specification text once the design is resolved; done means the proposal is accepted and consistently specified.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css
- Domain
- web-dev
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100