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https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties
Jun 21, 2019 · Using CSS custom properties (variables) ... If the browser doesn't support CSS custom Properties, the fallback value won't help. It's just a backup for the browser which supports CSS Custom Properties to choose a different value if the given variable isn't defined or has an invalid value.
https://www.w3schools.com/css/css3_variables.asp
Variables in CSS should be declared within a CSS selector that defines its scope. For a global scope you can use either the :root or the body selector. The variable name must begin with two dashes (--) and is case sensitive! The syntax of the var() function is as follows:
https://developer.mozilla.org/en-US/docs/Web/CSS/var
The var() CSS function can be used to insert the value of a custom property (sometimes called a "CSS variable") instead of any part of a value of another property. var(--header-color, blue); The var() function cannot be used in property names, selectors or anything else besides property values. (Doing so usually produces invalid syntax, or else ...
https://stackoverflow.com/questions/26633258/how-can-i-detect-css-variable-support-with-javascript
The latest version of Firefox has support for CSS Variables, but Chrome, IE and loads of other browsers do not.It should be possible to access a DOM Node or write a little method which returns whether the browser supports this feature, but I haven't been able to find anything which is currently able to do this.
https://jhildenbiddle.github.io/css-vars-ponyfill/
css-vars-ponyfill - Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers
https://www.freecodecamp.org/news/everything-you-need-to-know-about-css-variables-c74d922ea855/
Most programming languages have support for variables. But sadly, CSS has lacked support for native variables from the very beginning. You write CSS? Then no variables for you. Well, except if you were using a preprocessor like Sass. Preprocessors like Sass sell the use of variables as a big add-on. A reason to try them. And you know what? It’s a pretty darn good reason. Well the web is ...
https://github.com/nuxodin/ie11CustomProperties
Jul 08, 2019 · CSS variables (Custom Properties) polyfill for IE11 - nuxodin/ie11CustomProperties. CSS variables (Custom Properties) polyfill for IE11 - nuxodin/ie11CustomProperties. Skip to content. ... The script makes use of the fact that IE has minimal custom properties support where properties can be defined and read out with the cascade in mind. This is ...
https://css-tricks.com/difference-between-types-of-css-variables/
Oct 25, 2016 · Variables are one of the major reasons CSS preprocessors exist at all. The ability to set a variable for something like a color, use that variable throughout the CSS you write, and know that it will be consistent, DRY, and easy to change is useful. You can use native CSS variables ("CSS Custom Properties") for the same reasons.
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
https://www.sitepoint.com/practical-guide-css-variables-custom-properties/
IE11, which has no support for CSS variables, renders the page with gray-colored text: Check out the live demo: See the Pen @supports with CSS Variables by SitePoint on CodePen. One downside to ...
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