1 Introduction

This document describes the level of support provided by Microsoft Edge for the ECMAScript® 2018 Language Specification, [ECMA-262/9:2018], published June 2018. The [ECMA-262/9:2018] specification is the ninth edition of the ECMAScript Language Specification. Since publication of the first edition in 1997, ECMAScript has grown to be one of the most widely used general purpose programming languages. It is best known as the language embedded in web browsers but has also been widely adopted for server and embedded applications.