PostCSS: Use postcss-preset-env
to polyfill newer CSS syntax to older browser targets
#8567
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see https://github.com/csstools/postcss-plugins/tree/1ac4688fdcc27fa894cb87b0074df6d873635cba/plugin-packs/postcss-preset-env
This ensures that we are using the right vendor prefixes where necessary (e.g.
-webkit-text-decoration
in addition totext-decoration
).This change also allows us to use the
light-dark()
CSS function to implement a dark UI mode in a more ergonomic way.