Commits on Feb 16, 2024

1. Remove note about sharing data between platform sensors …

   The original note was added in #267 and expanded in #347, but its advice is
   impractical:
   - Sharing the activated sensors objects between multiple browsing
     contexts/documents/windows means these Sensor objects could potentially be
     shared by contexts in different top-level traversables (i.e. different
     tabs).
     Furthermore, if "can expose sensor readings" passes for one context but
     not the other, "update sensor reading" would still invoke "report latest
     reading updated" with sensors that cannot expose sensor readings.
   - Similarly, if the latest reading map is shared between multiple contexts,
     an update would affect all contexts, including those for which "update
     sensor reading" should not have been invoked in the first place (e.g. two
     pages with the same origin share the latest readings map, but only one is
     visible; updates to the latest reading map would be accessible from the
     other as well).
   
   PR #267 also made the "platform sensor" concept used in this section
   per-browsing context (although in a very confusing way), which on its own is
   a stricter requirement than what the note allowed, so we can drop the note
   without making things less secure.
   
   Incidentally, this also gets rid of one of the usages of "browsing context"
   in the spec, which helps with #444.

   

   rakuco committed Feb 16, 2024
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