css-vars-ponyfill

Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers
v2.4.9 URL: https://unpkg.com/css-vars-ponyfill@2.4.9/dist/css-vars-ponyfill.min.js
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clientcomponentcsscustom propertiescustom propertycustomdomes6ieie9ie10ie11internet explorerjavascriptjslegacymodulemutationobserverpolyfillponyfillpropertiespropertyruntimeshadowvariablesvarswatchweb

postcss-custom-properties

Use Custom Properties Queries in CSS
v14.0.6 URL: https://unpkg.com/postcss-custom-properties@14.0.6/dist/index.cjs
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csscsswgcustomdeclarationspostcsspostcss-pluginpropertiesspecificationvariablesvarsw3c

@csstools/postcss-progressive-custom-properties

Correctly declare progressive enhancements for CSS Custom Properties.
v4.2.1 URL: https://unpkg.com/@csstools/postcss-progressive-custom-properties@4.2.1/dist/index.cjs
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csscustomdeclarationspostcsspostcss-pluginprogressivepropertiesutilityvariablesvars

computed-variables

Event-driven custom CSS variables
v0.2.0 URL: https://unpkg.com/computed-variables@0.2.0/index.js
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csscustomvariablepropertiespropertyfunctionpluginmixinextension

postcss-custom-media

Use Custom Media Queries in CSS
v11.0.6 URL: https://unpkg.com/postcss-custom-media@11.0.6/dist/index.cjs
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at-ruleatrulecsscsswgcustommediapostcsspostcss-pluginqueriesqueryspecificationw3c