From ad110bd88578a44013ba617feae55bffcf89cb0e Mon Sep 17 00:00:00 2001 From: Raphael Kubo da Costa Date: Sat, 17 Feb 2024 12:25:45 +0100 Subject: [PATCH] Remove note about sharing data between platform sensors (#482) 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. --- index.bs | 5 ----- 1 file changed, 5 deletions(-) diff --git a/index.bs b/index.bs index 18d36d6..cf2ddd6 100644 --- a/index.bs +++ b/index.bs @@ -808,11 +808,6 @@ The current [=browsing context=]'s [=platform sensor=] must have: latest available [=sensor readings=]. - An associated [=sensor type=]. -Note: User agents can share the [=latest reading=] [=ordered map|map=] and -the [=activated sensor objects=] [=ordered set|set=] between different -[=browsing context|contexts=] only if the [=/origins=] of these contexts' [=active documents=] -are [=same origin-domain=]. - Any time a new [=sensor reading=] for a [=platform sensor=] is obtained and if the user agent [=can expose sensor readings=] to the current [=browsing context=]'s [=active document=], the user agent invokes [=update latest reading=] with the [=platform sensor=] and