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    <p>Wikipedia's page about <a href="http://en.wikipedia.org/wiki/Ecmascript" rel="nofollow noreferrer">ECMAScript</a> states <em>(quoting)</em> :</p> <blockquote> <p>ECMAScript is a scripting language, standardized by Ecma International in the ECMA-262 specification and ISO/IEC 16262. The language is widely used on the web, especially in the form of its three best-known dialects, <a href="http://en.wikipedia.org/wiki/Javascript" rel="nofollow noreferrer">JavaScript</a>, <a href="http://en.wikipedia.org/wiki/Actionscript" rel="nofollow noreferrer">ActionScript</a>, and <a href="http://en.wikipedia.org/wiki/JScript" rel="nofollow noreferrer">JScript</a>.</p> </blockquote> <p>So I'm guessing that those three languages sort-of are "children" of ECMAScript, and that each of those choose to implement <em>(or not)</em> some specific features -- while all keeping the same root.</p> <p><br> The page about <a href="http://en.wikipedia.org/wiki/Actionscript" rel="nofollow noreferrer">ActionScript</a> kind of confirms that, stating <em>(quoting, emphasis mine)</em> :</p> <blockquote> <p>ActionScript is a scripting language <strong>based on</strong> ECMAScript.</p> </blockquote> <p>I suppose this "based on" is the important part.</p> <p><br> Also, there might be a difference depending on the version of ECMAScript that is used, I'd say -- especially considering people are talking about <a href="http://en.wikipedia.org/wiki/Ecmascript#ECMAScript.2C_5th_Edition" rel="nofollow noreferrer">ECMAScript 5</a>, and that, for instance, <a href="http://en.wikipedia.org/wiki/Javascript#Syntax_and_semantics" rel="nofollow noreferrer">Javascript is based on ECMAScript 3</a> :</p> <blockquote> <p>As of 2009, the latest version of the language is JavaScript 1.8.1. It is a superset of ECMAScript (ECMA-262) Edition 3.</p> </blockquote>
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