[tor-bugs] #21793 [Applications/Tor Browser]: Keep an eye on the CustomElementRegistry API

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#21793: Keep an eye on the CustomElementRegistry API
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff59-esr, tbb-linkability, tbb-7.0   |  Actual Points:
  -must-alpha, TorBrowserTeam201705R             |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by arthuredelstein):

 * keywords:  ff52-esr, tbb-linkability, tbb-7.0-must-alpha => ff59-esr,
     tbb-linkability, tbb-7.0-must-alpha, TorBrowserTeam201705R
 * status:  new => needs_review


Comment:

 I confirmed in TBB 7.0a3 that:
 * The pref "dom.webcomponents.customelements.enabled" is false.
 * Mozilla's [https://developer.mozilla.org/en-
 US/docs/Web/Web_Components/Custom_Elements#live_example live example]
 indicates that Custom Elements are not supported.
 * In the JS console, `window.customElements` is `undefined` by default.

 So I think we can postpone until ff59-esr.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21793#comment:4>
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