Hi Mike,

As far as I understand, no developer-facing changes are introduced by this
intent, so the article <https://web.dev/multi-screen-window-placement/> doesn't
need changing, unless you want to mention feature detection and how this is
in particular *not* detectable. Please advise.

Cheers,
Tom


On Tue, May 10, 2022 at 2:35 AM Mike Wasserman <m...@chromium.org> wrote:

> Contact emails
>
> m...@chromium.org
>
>
> Explainer
>
>
> https://github.com/w3c/window-placement/blob/main/EXPLAINER_initiating_multi_screen_experiences.md
>
> Specification
>
>
> https://github.com/w3c/window-placement/blob/main/EXPLAINER_initiating_multi_screen_experiences.md#spec-changes
>
> Design docs
>
>
> https://docs.google.com/document/d/1RRlGQharWVnmxKTomfKhNiaeE31L7iXHeXVfifOvwJA
>
> Summary
>
> Fullscreen Companion Window allows sites to place fullscreen content and a
> popup window on separate screens from a single user activation.
>
> This is a small requested enhancement of the Multi-Screen Window Placement
> feature: https://chromestatus.com/feature/5252960583942144
>
> Blink component
>
> Blink>Screen>MultiScreen
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EScreen%3EMultiScreen>
>
> TAG review
>
> https://github.com/w3ctag/design-reviews/issues/602#issuecomment-1121694034
>
> TAG review status
>
> Pending
>
> Risks
> Interoperability and Compatibility
>
> The main risk is that this feature fails to become an interoperable part
> of the web platform if other browsers do not implement it. Scripted
> attempts to open a popup window after requesting fullscreen would likely be
> blocked by user agents that do not implement this feature, even if they
> implement the basic Multi-Screen Window Placement API.
>
> Gecko: No signal (
> https://github.com/mozilla/standards-positions/issues/636)
>
> WebKit: No signal (
> https://lists.webkit.org/pipermail/webkit-dev/2022-May/032223.html)
>
> Web developers: Positive (
> https://bugs.chromium.org/p/chromium/issues/detail?id=1233970) This
> functionality is requested by a prominent API partner
>
> Ergonomics
>
> There is currently no way to detect feature support before attempted
> usage; see
> https://docs.google.com/document/d/1RRlGQharWVnmxKTomfKhNiaeE31L7iXHeXVfifOvwJA/edit?pli=1#heading=h.vu2lz7aeddz6
>
> Activation
>
> Developers can make immediate use of this API enhancement.
>
> Security
>
> This feature was designed from the ground-up to adhere to the strictest
> usable security measures possible, as an incremental enhancement of
> existing web platform APIs. See the design document for details.
>
> WebView application risks
>
> None
>
> Debuggability
>
> Existing mechanisms support debugging fullscreen and popup window open
> requests.
>
> Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
> ?
>
> No. An existing automated/manual WPT covers the ability to open
> cross-screen popups <https://wpt.live/window-placement>. We aim to extend
> test coverage for this specific scenario soon <https://crbug.com/1323361>.
>
> DevTrial instructions
>
> https://github.com/w3c/window-placement/blob/main/HOWTO.md
>
> Flag name
>
> --enable-blink-features=WindowPlacement
>
> Requires code in //chrome?
>
> True -
> https://docs.google.com/spreadsheets/d/1QV4SW4JBG3IyLzaonohUhim7nzncwK4ioop2cgUYevw/edit#gid=0&range=34:34
>
> Tracking bug
>
> https://crbug.com/1233970
>
> Launch bug
>
> https://crbug.com/1315615
>
> Sample links
>
> https://michaelwasserman.github.io/window-placement-demo/
>
> (See DevTrial instructions)
>
> Estimated milestones
>
> DevTrial on desktop: 102
>
> Shipping on desktop: 103
>
> Anticipated spec changes
>
> No changes anticipated that would introduce web compat/interop risk
>
> Link to entry on the Chrome Platform Status
>
> https://chromestatus.com/feature/5173162437246976
>
> Links to previous Intent discussions
>
> Intents for the Multi-Screen Window Placement API:
>
>    -
>
>    I2P: <
>    https://groups.google.com/a/chromium.org/g/blink-dev/c/X6rEbWvU7cI>
>    -
>
>    I2E1: <
>    https://groups.google.com/a/chromium.org/g/blink-dev/c/C6xw8i1ZIdE>
>    -
>
>    I2E2: <
>    https://groups.google.com/a/chromium.org/g/blink-dev/c/jznxQK1U8ZQ>
>    -
>
>    I2S: <
>    https://groups.google.com/a/chromium.org/g/blink-dev/c/i6Zoc7jU0dM>
>
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>


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