[w3ctag/design-reviews] IntersectionObserver V2 (#328)

こんにちはTAG！

I'm requesting a TAG review of:

  - Name: IntersectionObserver V2
  - Specification URL: https://szager-chromium.github.io/IntersectionObserver/

  - Explainer, Requirements Doc, or Example code: https://github.com/szager-chromium/IntersectionObserver/blob/master/explainer.md

  - Tests: https://chromium.googlesource.com/chromium/src/+/master/third_party/blink/web_tests/intersection-observer/v2/

https://chromium.googlesource.com/chromium/src/+/master/third_party/blink/web_tests/http/tests/intersection-observer/v2/

   - Primary contacts: szager-chromium

Further details (optional):

  - Relevant time constraints or deadlines: [please provide]
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/).
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that...

This feature is currently implemented in chromium, hidden behind a flag:

--enable-blink-features=IntersectionObserverV2

There are some ham-fisted demos:

https://szager-chromium.github.io/IntersectionObserver/demo/cashbomb/hidden/

http://szager-chromium.github.io/IntersectionObserver/demo/cashbomb/transparent/

http://szager-chromium.github.io/IntersectionObserver/demo/svg/


We'd prefer the TAG provide feedback as (please select one):

  - [x] open issues in our Github repo for each point of feedback: https://github.com/szager-chromium/IntersectionObserver/issues

  - [ ] open a single issue in our Github repo for the entire review
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]

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