Dec 12, 2025 · In this guide, we’ll demystify "JavaScript versions" (hint: it’s really about ECMAScript support), walk through step-by-step methods to check support in popular browsers (Chrome, Firefox, …

Nov 24, 2010 · A much more reliable way is to actually check if new additions of a specific version are actually present. I wrote this snippet that does exactly that, and returns the JavaScript version …

ECMAScript is the official name of the JavaScript standard. JavaScript was invented by Brendan Eich in 1995 and became an ECMA standard in 1997. The firs ECMAScript versions was abbreviated by …

Sep 7, 2025 · How to check the version of JavaScript installed on your computer. Learn simple steps to identify the JavaScript version using browser-specific tools.

Mar 11, 2025 · In this article, we will explore how to check the JavaScript version using various methods. While JavaScript itself does not have a built-in version checker, we can use different techniques to …

To get the Javascript version that your browser is using, just set a variable and then try to overwrite it in the next script where you set a language-specific version. Here is how you do it. This will throw an …

Jun 24, 2023 · To determine the JavaScript version of a website, you can inspect the source code to see if it contains a specific ECMAScript version declaration or check the features used in the code.

Jun 26, 2024 · Find out what version of JavaScript/ECMAScript your web browser supports - Javascript is built into your web browser but there are different versions of it.

Sep 7, 2020 · As a result, it is important to know which version of JavaScript you are running so you can make a decision about whether to upgrade it or not. In this tutorial, we will look at ways to check what …

Sep 7, 2011 · How can I detect what version of JavaScript the browser supports (if any)? I want to check for ECMAScript 3 versus ECMAScript 5 versus ECMAScript 6. Note: I want to avoid the deprecated …