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https://www.devcurry.com/2011/06/javascript-strict-mode-support-in.html
JavaScript: Strict Mode support in Browsers and Backward Compatibility Tweet: Strict Mode was introduced in ECMAScript 5.0 and is intended to make programs simpler and free of errors. In strict mode, a more rigid set of syntax checks is used to either catch an undeclared variable or any other errors in your code. Strict mode changes semantics!
https://www.w3schools.com/js/js_strict.asp
The purpose of "use strict" is to indicate that the code should be executed in "strict mode". With strict mode, you can not, for example, use undeclared variables. All modern browsers support "use strict" except Internet Explorer 9 and lower:
https://love2dev.com/blog/javascript-strict-mode/
JavaScript Strict Mode Support. This is a very safe feature to use. Every modern browser and node supports and has supported strict mode for years. If the browser does not support strict mode the expression is simply ignored. It is just a string followed by a semi-colon, a perfectly legal JavaScript statement. What Strict Mode Breaks
https://humanwhocodes.com/blog/2012/03/13/its-time-to-start-using-javascript-strict-mode/
Mar 13, 2012 · Even though this looks like a string that isn’t assigned to a variable, it actually instructs conforming JavaScript engines to switch into strict mode (browsers that don’t support strict mode simply read this as an unassigned string and continue to work as usual). You can use it either globally or within a function.
https://developer.mozilla.org/it/docs/Web/JavaScript/Reference/Strict_mode
Mar 24, 2019 · Strict mode in browsers. The major browsers now implement strict mode. However, don't blindly depend on it since there still are numerous Browser versions used in the wild that only have partial support for strict mode or do not support it at all (e.g. Internet Explorer below version 10!). Strict mode changes semantics.
http://kangax.github.io/compat-table/es5/
Specifically, `0 in [,]` and `0 in [undefined]` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. As such, ES5 array iteration methods can only be shimmed reliably when dealing with dense arrays.
https://www.lambdatest.com/ECMAScript-5-Strict-Mode
With LambdaTest you can test your website on 2000+ browser and OS combinations for cross browser compatibility issues and ensure that your webpage fallbacks are working fine on browsers that do not support JAVASCRIPT ECMAScript 5 Strict Modecode>.
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