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There is a common misconception that Java Script was influenced by an earlier Web page scripting language developed by Nombas named Cmm (not to be confused with the later C-- created in 1997).
Microsoft script technologies including VBScript and JScript were released in 1996.
With the release of Internet Explorer 4, Microsoft introduced the concept of Dynamic HTML, but the differences in language implementations and the different and proprietary Document Object Models remained and were obstacles to widespread take-up of Java Script on the Web.
In November 1996, Netscape submitted Java Script to Ecma International to carve out a standard specification, which other browser vendors could then implement based on the work done at Netscape.
Initially only implemented client-side in web browsers, Java Script engines are now embedded in many other types of host software, including server-side in web servers and databases, and in non-web programs such as word processors and PDF software, and in runtime environments that make Java Script available for writing mobile and desktop applications, including desktop widgets.
Netscape Communications then decided that the scripting language they wanted to create would complement Java and should have a similar syntax, which excluded adopting other languages such as Perl, Python, TCL, or Scheme.
To defend the idea of Java Script against competing proposals, the company needed a prototype. Although it was developed under the name Mocha, the language was officially called Live Script when it first shipped in beta releases of Netscape Navigator 2.0 in September 1995, but it was renamed Java Script as a marketing ploy by Netscape to give Java Script the cachet of what was then the hot new Web programming language.
This led to the official release of the language specification ECMAScript published in the first edition of the ECMA-262 standard in June 1997, with Java Script being the most well known of the implementations.
Action Script and JScript are other well-known implementations of ECMAScript.
and all major web browsers have a dedicated Java Script engine to execute it.