JScript is Microsoft’s implementation of ECMAScript but could be described more efficiently as a dialect of ECMAScript.
ActionScript is another dialect of ECMAScript that was originally developed by Macromedia Inc. for Macromedia Flash before it got acquired by Adobe and became Adobe Flash; later changed to be known as Adobe Animate.
Eich: ECMAScript is the standards name for the language. Its number is ECMA-262 and it’s a name that the standards body came up with because they couldn’t get anybody to donate a trademark that was agreeable to all parties. So there’s an issue with marketing the programming languages.
2 "JScript (ECMAScript3)," 23 October 2011. [Online].
3 "Where is Flash Professional?," 8 May 2019. [Online].