1 Introduction

This document describes extensions provided by JScript 5.x in these modes of Windows Internet Explorer: Quirks Mode, IE7 Mode, and IE8 Mode. The JScript 5.x dialects of ECMAScript are based on the ECMAScript Language Specification 3rd Edition [ECMA-262-1999], published in 1999.

Section 2 of this specification is normative. All other sections and examples in this specification are informative.