Question

What version of JavaScript does QIE support?  What is ECMAScript and what version does QIE support?

Answer 1

QIE uses the Mozilla Rhino JavaScript engine. Use the table below summarizes the Rhino JavaScript engine version used in the most recent QIE releases:

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QIE Version	Release Date	Rhino Version
25.4	Jan 2026	1.8.1
25.3	Sep 2025	1.8.0
24.3	Oct 2024	1.7.15
23.4	Nov 2023	1.7.14
(older versions)		1.7 R5 or less

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Rhino JavaScript engine support for ECMAScript 2015 (ES6), ES2016, ES2017 & ES2018 can be found here:  https://mozilla.github.io/rhino/compat/engines.html