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https://stackoverflow.com/questions/121203/how-to-detect-if-javascript-is-disabled
<noscript> IS the most semanticly accurate way to specify non-javascript content - and rather then detecting if javascript is disabled, detect if it's enabled. So show the "you need javascript to properly use my site" message by default, but hide it with a javascript function immediately onLoad. – matt lohkamp Sep 23 '08 at 23:58
https://www.yourhtmlsource.com/javascript/supportdetection.html
As a side note, the original plan for object detection was that it would be achieved using the language attribute of the script tag. When you have <script language="JavaScript 1.2" type="text/javascript"> any browser that doesn't support JavaScript 1.2 methods was supposed to bypass this whole block of code.
https://davidwalsh.name/detect-webp
Aug 15, 2017 · Since GIPHY lazy loads its images, GIPHY has the opportunity to use WEBP feature detection with JavaScript. Googler and Service Worker pioneer Jake Archibald recently tweeted a snippet showing how you can use a service worker to detect WEBP support:
https://www.sitepoint.com/detect-css3-property-browser-support/
May 23, 2011 · Feature detection used to be so much easier. Browser sniffing was a reasonable solution in the early days of the web. Developers would check the user agent and run JavaScript …
https://stackoverflow.com/questions/2400935/browser-detection-in-javascript
Browser detection in JavaScript? [duplicate] Ask Question Asked 9 years, ... good question because of suggested detection of feature support rather than extraction of name and version in answers. ... The JQuery $.support property is available for detection of support for particular features rather than relying on browser name and version.
https://stackoverflow.com/questions/29046635/javascript-es6-cross-browser-detection
How can I find out the browser's Javascript engine version and support to ECMAScript 6? I'm using navigator.appVersion just to know the browser's version, but not the engine's version. ... Javascript ES6 cross-browser detection. Ask Question Asked 4 years, ... Now, coming to the real problem: if you want to detect the support to ES6, ...
http://perfectionkills.com/detecting-event-support-without-browser-sniffing/
Apr 01, 2009 · Javascript rants and findings, by kangax. Detecting event support without browser sniffing. One of the pain points of feature testing in client-side scripting is that for event support.DOM doesn’t really specify any means to detect exactly which events browser understands and can work with.
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