Re: [w3c/clipboard-apis] Add comprehensive clipboardchange event specification with ClipboardChangeEventInit dictionary (PR #239)

@zgroza commented on this pull request.



> @@ -224,12 +227,166 @@ url: https://w3c.github.io/permissions/#permissions-task-source; type: dfn;
    * Scripts that use the [[#async-clipboard-api]] to write to the clipboard
    * Actions that update the clipboard outside the user agent
 
-   If the clipboard contents are changed outside the user agent, then the
-   {{GlobalEventHandlers/clipboardchange}} event MUST fire when the user agent regains focus.
+   <div class="algorithm" data-algorithm="fire-clipboardchange-event">
+   <h5 id="h-fire-clipboardchange-event">To fire a clipboardchange event</h5>
+
+   To <dfn export>fire a clipboardchange event</dfn> given a {{Document}} <var>document</var>:
+
+   1. If <var>document</var> does not have [=sticky activation=] and <var>document</var> does not have permission to read from the clipboard, then return.
+
+   2. Let <var>global</var> be <var>document</var>'s [=relevant global object=].
+
+   3. If <var>document</var> has [=system focus=]:
+    1. Let <var>types</var> be a list of [=mandatory data types=] available on the [=system clipboard=].
+    2. Let <var>changeId</var> be a unique identifier for this clipboard change, generated by applying a partition-specific transformation to a system-level clipboard change identifier, ensuring that different [=partitions=] receive different identifiers for the same clipboard change while maintaining consistency within the same [=partition=].

As discussed in the meeting, yes. I too think this is rather a formality and sites most likely wouldn't be able to exploit this, but it's intuitively more consistent with how partitions are observable by the users.

Can we go with the second option—putting the random salt on every shelf?

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