Re: [w3c/clipboard-apis] Clarifying `clipboard.readText()` behaviour (Issue #236)

EdgarChen left a comment (w3c/clipboard-apis#236)

> Regarding the last steps:
> 
> > 1. For each systemClipboardItem in data:
> >    ...
> > 2. [Reject](https://webidl.spec.whatwg.org/#reject) p with ["NotFoundError"](https://webidl.spec.whatwg.org/#notfounderror) [DOMException](https://webidl.spec.whatwg.org/#idl-DOMException) in realm.
> > 3. Return p.
> 
> Is it to return an error if the clipboard is empty or if no systemClipboardItem has a string representation? Tested with Firefox and Edge and they don't raise an exception.

Like https://github.com/w3c/clipboard-apis/issues/236#issuecomment-2852181789, I don't think this is for readText() steps...

I also tested Chrome, and it doesn’t raise an exception when the system clipboard is empty.
This aligns with the behavior of `read()`, where there is a similar discussion in https://github.com/w3c/clipboard-apis/issues/179, and the conclusion is that `read()` should not raise an exception when system clipboard is empty, but resolve with empty sequence.


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