ECMA stands for European Computer Manufacturer's Association. They are well known to create standards in the computer industry.
In 1999, with the release of the 3rd iteration, ECMAScript 3, the project went into hibernation for 10 long years, and no new version was released until 2009. During this period, Microsoft's IE lost its dominance to modern browsers like Mozilla and Chrome, which set a new course for dynamic web pages, by making the rendering process fast and supporting all the standards.
ECMAScript 4 was never released, and ECMAScript 5 was released in 2009, and since then it never looked back.
The latest release for ECMAScript is its 8th Edition, which was finalized in June 2017.