[w3ctag/spec-reviews] Navigation Preload for Service Worker (#166)

Hello TAG!

I'm requesting a TAG review of:

  - Name: Navigation Preload
  - Specification URL: [Service Worker spec](https://w3c.github.io/ServiceWorker/) but only the parts relevant to Navigation Preload [merged PR](https://github.com/w3c/ServiceWorker/pull/983#event-896743586)
  - Explainer, Requirements Doc, or Example code: [explainer](https://github.com/w3c/ServiceWorker/blob/master/explainer.md), [developer article](https://developers.google.com/web/updates/2017/02/navigation-preload), [demo](https://mattto.github.io/sw/demo/navigation-preload/)
  - Primary contacts: @jakearchibald, @kenjibaheux, @mattto,

Further details (optional):

  - Relevant time constraints or deadlines: as soon as possible. Sincere apologies for the late request but we believe that this API is ready for launch and have many key developers blocked on its availability in order to invest into service worker for better performance and user experience.
 
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 [github usernames]


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