[w3ctag/design-reviews] HTMLInputElement showPicker() (Issue #688)

Braw mornin' TAG!

I'm requesting a TAG review of the `showPicker()` method for `HTMLInputElement`.

The `showPicker()` element is a new addition to `HTMLInputElement` which addresses a [very common request from web developers](https://www.google.com/search?q=programmatically+open+date+picker+site%3Astackoverflow.com): programmatically showing a picker for controls like date etc.

  - Explainer¹ (minimally containing user needs and example code): inline in https://github.com/whatwg/html/pull/7319

  - Specification URL: draft at https://whatpr.org/html/7319/input.html#dom-input-showpicker

  - Tests:
    - https://github.com/web-platform-tests/wpt/blob/master/html/semantics/forms/the-input-element/show-picker.tentative.html

    - https://github.com/web-platform-tests/wpt/blob/master/html/semantics/forms/the-input-element/show-picker-cross-origin-iframe.tentative.html

  - User research: None
  - Security and Privacy self-review²: Hopefully not necessary; if you think it is let us know and we can fill it out.
  - GitHub repo (if you prefer feedback filed there): https://github.com/whatwg/html/pull/7319

  - Primary contacts (and their relationship to the specification):
      - Domenic Denicola (@domenic, Google, specifier)
      - François Beaufort (@beaufortfrancois, Google, implementer and person who started us on this journey)
  - Organization(s)/project(s) driving the specification: WHATWG HTML triage call (https://github.com/whatwg/html/issues/6884)
  - Key pieces of existing multi-stakeholder review or discussion of this specification: https://github.com/whatwg/html/issues/6909; https://github.com/whatwg/html/issues/3232 is also relevant
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/feature/5692248021794816


Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: The next WHATWG HTML triage call is 2021-12-02 and it'd be great to have any feedback by then
  - The group where the work on this specification is currently being done: WHATWG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): N/A
  - Major unresolved issues with or opposition to this specification: None known
  - This work is being funded by: Google

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  💬 leave review feedback as a **comment in this issue** and @-notify @domenic, @beaufortfrancois, and @annevk

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