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IE’ SCRipting engines<br />
• In Windows, JavaScript is implemented as a COM DLL that can be hosted by various<br />
applications:<br />
• Windows Script Host (wsh)<br />
• Internet Explorer<br />
• Before version 9, IE used the same JavaScript engine as WSH - Jscript.dll<br />
Internet<br />
Explorer 8<br />
Jscript.dll<br />
wsh<br />
• In IE9 a different DLL has been shipped – Jscript9.dll, designed specifically for the browser<br />
• To make it better backward compatible, Jscript9 engine can emulate IE8 and IE7 doc modes, by<br />
keeping the same behavior as legacy engine<br />
• emulating the legacy engine doesn’t actually mean loading the legacy engine!<br />
Internet<br />
Explorer 9<br />
Jscript9.dll<br />
wsh<br />
Jscript.dll
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