input type="file", the "files" property is now read-write

[vannilla]

I'm not sure when it changed, but in other browsers the files property of the HTMLInputElement object can be assigned to if you pass a DataTransfer instance.
The living standard actually says that user agents can make it not mutable but Pale Moon is the only browser doing so, if we do not count old versions of Safari (before 14, released in 2020).

I found this out because I was asked to implement a drag-and-drop thingamajig and for a number of reasons I cannot use the trick other systems employ where the file is uploaded in the background and what's passed around is an ID, so all I could do was trying to change the actual input element. So far only Pale Moon "breaks" it.

It's fine if it's kept not mutable if there is not a desire to change it, but since I happened to stumble upon it I thought I'd share.

[Moonchild]

I think this is a fair enough request. I'll file an issue on the repo.

EDIT: Issue #2458 (UXP)

[Moonchild]

Painless for a change. This will be in v33.0.0

[vannilla]

Cool, it's always great when changes are smooth.

[Moonchild]

Cool, it's always great when changes are smooth.

It is! I wish it happened more often.