[w3ctag/design-reviews] Review request for ResizeObserver (#187)

Hello TAG!

I'm requesting a TAG review of:

  - Name: ResizeObserver
  - Specification URL: [spec url]
  - Explainer: [https://github.com/WICG/ResizeObserver/blob/master/explainer.md]
  - Primary contacts: @atotic

Further details (optional):

  - Relevant time constraints or deadlines: Chrome would like to ship in M62 (Aug 31st, 2017 branch point)
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The [assessment is here](https://github.com/WICG/ResizeObserver/blob/master/security-privacy.txt).
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

Previous discussions/implementations:

Many of the interesting design decisions have been discussed on ResizeObserver github [issues](https://github.com/WICG/ResizeObserver/issues). 
- [Which strategy for preventing infinite loop when delivering resize notifications](https://github.com/WICG/ResizeObserver/issues/7)?
- [What is initial state of ResizeObservation content size](https://github.com/WICG/ResizeObserver/issues/8)?

Chrome has [implemented](https://crbug.com/612962) ResizeObserver behind a flag.
Firefox has [worked](https://bugzilla.mozilla.org/show_bug.cgi?id=1272409) on ResizeObserver implementation.
ResizeObserver has been discussed at TPAC meeting in Lisbon 2016.

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

  - [ ] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [x] leave review feedback as a comment in this issue and @-notify [@atotic]



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