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Re:Flash Player is about to stop working on Windows 10 by muldvarp on Wednesday December 30, 2020 @05:29PM (#25586981)
Flash was proprietary, didn't have a specification and only one real implementation ever existed.
Re:Flash Player is about to stop working on Windows 10 by userbinator on Wednesday December 30, 2020 @09:59PM (#25589110)
What is all this BS about it being proprietary...

https://www.adobe.com/content/dam/acom/en/devnet/pdf/swf-fil...

Straight from the horse's mouth, as they say.

There's also a few other implementations, although they found use embedded in games and such instead of being browser plugins.

Re:Flash Player is about to stop working on Windows 10 by anthk on Thursday December 31, 2020 @10:46AM (#25593682)
It was and gnash/lightspark barely worked.
Re:Flash Player is about to stop working on Windows 10 by johnchristopher on Wednesday December 30, 2020 @05:37PM (#25587074)
Flash was using actionscript which was ecma262-3/4.
Re:Flash Player is about to stop working on Windows 10 by duskwuff on Wednesday December 30, 2020 @06:19PM (#25587499)
ActionScript only "existed" on the authoring side. Scripts were compiled to (proprietary) bytecode before being embedded in the SWF file.

Besides, there's a lot more to SWF than the scripts.