[w3ctag/design-reviews] Performance Timeline (#644)

Ya ya yawm TAG!

I'm requesting a TAG review of Performance Timeline.

This is actually a request to confirm or amend previous review, as requested in the CR transition
https://github.com/w3c/transitions/issues/339#issuecomment-850639142


This specification was originally developed in levels, Level 1 in REC in 2013,
Level 2 has had a wide review in 2016 before entering CR 
https://www.w3.org/TR/2016/CR-performance-timeline-2-20161208/

There is no fundamental change to the goals of the spec. The processing model is more detailed and
data structure updated.
We plan to drop levels and use a living standard development model (from process2020).

  - Explainer¹ (minimally containing user needs and example code): giving the history of this spec, its scope is hopefully well-understood at this point. From the Director's comment in the CR transition request, it seems that only recent changes would eventually need a review.
  - Specification URL: https://w3c.github.io/performance-timeline/

  - Tests: [wpt folder(s), if available] https://wpt.fyi/results/performance-timeline/

  - Security and Privacy self-review²: https://w3c.github.io/perf-security-privacy/#privacy-and-security-considerations

  - GitHub repo (if you prefer feedback filed there): https://github.com/w3c/performance-timeline/issues

  - Primary contacts (and their relationship to the specification): @yoavweiss, @caribouW3
  - Organization(s)/project(s) driving the specification:  WebPerf WG


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

  🐛 open issues in our GitHub repo for **each point of feedback**

  💬 leave review feedback as a **comment in this issue** and @-notify [github usernames] 


Thank you!



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