Pre-apply orientation lock via FullscreenOptions

[marcoscaceres]

Seeking feedback on this draft proposal from implementers and community at large.

The potential advantages with this proposal are numerous:

• Potentially smoother visual transition when switching to fullscreen.
• Releasing the orientation is explicitly tied to exiting fullscreen (per #202)
• Easier to use than Screen Orientation Lock API, while also working together with it (via events, and also allowing orientation changes after going fullscreen).

Usage example:

document.documentElement.requestFullscreen({ orientation: "landscape" });

Addresses #186

• [ ] At least two implementers are interested (and none opposed):
  • …
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
• [ ] MDN issue is filed: …

(See WHATWG Working Mode: Changes for more details.)

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[foolip]

@marcoscaceres is this something you'd still like to pursue? Is there implementer interest?