[w3ctag/design-reviews] Intersection Observer Scroll Margin (Issue #905)

Hello TAG reviewers!

I'm requesting a TAG review of "Intersection Observer Scroll Margin".

Intersection Observer scrollMargin allows developers to observe targets inside nested scroll containers that are currently clipped away by the scroll containers. This is achieved by expanding the container's clipping rect by the scrollMargin when calculating the intersection.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/w3c/IntersectionObserver/issues/431
  - Specification URL: https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-scrollmargin
  - Tests: https://wpt.fyi/results/intersection-observer?label=master&label=experimental&aligned&q=scroll-margin
  - User research: N/A
  - Security and Privacy self-review²: N/A
  - GitHub repo (if you prefer feedback filed there): N/A
  - Primary contacts (and their relationship to the specification):
      - Traian Captan (tcaptan-cr, Google)
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification: https://github.com/w3c/IntersectionObserver/issues/431#issuecomment-1542502858
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5091020593430528

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: Implementation complete
  - The group where the work on this specification is currently being done: w3c
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): w3c
  - Major unresolved issues with or opposition to this specification: None
  - This work is being funded by: Google

You should also know that...

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 tcaptan-cr


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