Strict Mode Browser Support

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JavaScript "use strict"

    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:

Can I use... Support tables for HTML5, CSS3, etc

    https://caniuse.com/
    Nov 04, 2019 · "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers. The site was built and is maintained by Alexis Deveria, with occasional updates provided by the web development community. The design used as of 2014 was largely created by Lennart Schoors. FAQ

What Is Javascript 'Use Strict' Mode And How Does It Work ...

    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. I hate to ...

Browser Compatibility Testing of ECMAScript 5 Strict Mode ...

    https://www.lambdatest.com/ECMAScript-5-Strict-Mode
    With LambdaTest you can perform browser comatibility testing of JAVASCRIPT ECMAScript 5 Strict Mode element across 2000+ browser-OS combinations. ... "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

JavaScript: Strict Mode support in Browsers and Backward ...

    https://www.devcurry.com/2011/06/javascript-strict-mode-support-in.html
    Since the Strict mode is declared as a string, it is backward compatible. Older browsers simply ignore it, without raising any errors. However you should make sure to test your code in browsers that do and do not support strict mode.

javascript - Is it safe to use 'use strict' in IE 8/9 ...

    https://stackoverflow.com/questions/18223517/is-it-safe-to-use-use-strict-in-ie-8-9
    There is some syntax allowed in strict mode that will fail outside of strict mode. In particular, using keywords as object properties. myObject.break = true works in strict mode, fails outside of it. – Jeremy J Starcher Aug 14 '13 at 9:22

Quirks mode - Wikipedia

    https://en.wikipedia.org/wiki/Strict_mode
    A third compatibility mode known as either "almost standards mode" or "strict mode" which maintains the "traditional" vertical sizing of table cells according to the CSS2 specification, has been implemented in these browsers: Safari, Opera 7.5 (and later), all Gecko-based browsers since 1.0.1 (such as Firefox) and Internet Explorer 8.



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