[w3ctag/design-reviews] TAG Review Request: Backdrop Filter (#353)

Góðan dag TAG！

I'm requesting a TAG review of:

  - Name: backdrop-filter
  - Specification URL: https://mfreed7.github.io/fxtf-drafts/filter-effects-2/Overview.html

  - Explainer: https://github.com/mfreed7/backdrop-filter-feature

  - Tests: https://github.com/web-platform-tests/wpt/tree/master/css/filter-effects (all tests prefixed with backdrop-filter-*)
  - Primary contacts: @mfreed7

Further details (optional):

  - Relevant time constraints or deadlines: None
  - [x] I have read and filled out the [Self-Review Questionnaire on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The [assessment is here](https://github.com/mfreed7/backdrop-filter-feature/blob/master/tag-security-privacy.md).
  - [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=CSSBackdropFilter

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 [@mfreed7]

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https://github.com/w3ctag/design-reviews/issues/353