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1 Introduction

This document describes extensions provided to the ECMAScript language that are implemented in IE9 Mode in Windows Internet Explorer 9 based on the ECMAScript Language Specification 5th Edition [ECMA-262/5], published December 2009. These are described in sections 2.1 through 2.8.

The implementation of the ECMAScript language in IE10 Mode in Windows Internet Explorer 10 is based on ECMAScript Language Specification 5.1 Edition [ECMA-262/51], published June 2011. All of the extensions to [ECMA-262/5] described in this document for IE9 Mode also apply to IE10 Mode in Internet Explorer 10. In addition, section 2.9 describes extensions to the ECMAScript Language Specification 5.1 Edition [ECMA-262/51] in IE10 Mode; these extensions are not available in versions prior to Internet Explorer 10.

The implementation of the ECMAScript language in IE11 Mode in Internet Explorer 11 is based on ECMAScript Language Specification 5.1 Edition [ECMA-262/51], published June 2011. All of the extensions to [ECMA-262/5] described in this document for IE10 Mode also apply to IE11 Mode in Internet Explorer 11 except that Section 2.1.1 Conditional Source Text Processing has been removed from IE11 Mode of Internet Explorer 11.

Sections 1.7 and 2 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. All other sections and examples in this specification are informative.

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