LGTM1. I think there is a small compat risk here but it should be 
manageable via the combination of: low popover + dialog usage so far, 
presumably by actively-updated sites, and a Finch flag if something breaks 
really badly.

On Wednesday, March 27, 2024 at 2:58:51 AM UTC+9 Mason Freed wrote:

> Contact emailsmas...@chromium.org
>
> ExplainerNone
>
> Specificationhttps://github.com/whatwg/html/pull/10116
>
> Summary
>
> The prior behavior caused issues if a top layer element (dialog, 
> fullscreen, etc.) was DOM-nested within a popover. The inner element, when 
> promoted to the top layer, would cause the outer popover to be hidden, 
> which also (via CSS display:none) hid the inner element. That, in turn, 
> caused issues at least for dialogs, which inert the entire page. This 
> change makes top layer elements "nestable" within popovers.
>
>
> Blink componentBlink>DOM>Popover 
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDOM%3EPopover>
>
> TAG reviewNone
>
> TAG review statusNot applicable
>
> Risks
>
>
> Interoperability and Compatibility
>
> This will "unbreak" a set of broken behaviors. The compat risk is 
> extremely low, given the recent launch of the Popover API, and the broken 
> current behavior. The small risk is that someone nested a top layer element 
> within a Popover, and then relied on it *not* being visible after being 
> shown.
>
>
> *Gecko*: Shipped/Shipping https://phabricator.services.mozilla.com/D200686
>
> *WebKit*: Positive Informal support at WHATNOT meeting: 
> https://github.com/whatwg/html/issues/10052#issuecomment-1911240732
>
> *Web developers*: Positive Issue raised by developers
>
> *Other signals*:
>
> WebView application risks
>
> Does this intent deprecate or change behavior of existing APIs, such that 
> it has potentially high risk for Android WebView-based applications?
>
> None
>
>
> Debuggability
>
> None
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac, 
> Linux, ChromeOS, Android, and Android WebView)?Yes
>
> Is this feature fully tested by web-platform-tests 
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ?Yes
>
>
> https://wpt.fyi/results/html/semantics/popovers?label=master&label=experimental&aligned&q=opover-top-layer-nesting
>
>
> Flag name on chrome://flagsNestedTopLayerSupport
>
> Finch feature nameNestedTopLayerSupport
>
> Requires code in //chrome?False
>
> Tracking bughttps://crbug.com/1520938
>
> Estimated milestones
> DevTrial on desktop 123
> DevTrial on Android 123
>
> Anticipated spec changes
>
> Open questions about a feature may be a source of future web compat or 
> interop issues. Please list open issues (e.g. links to known github issues 
> in the project for the feature specification) whose resolution may 
> introduce web compat/interop risk (e.g., changing to naming or structure of 
> the API in a non-backward-compatible way).
> None
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/5149353645965312?gate=5083908142268416
>
> This intent message was generated by Chrome Platform Status 
> <https://chromestatus.com/>.
>

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