The challenge till this is widely supported (caniuse.com currently pegs it at 46% globally [1]) will be using this as a progressive enhancement that does not provide a worse or unusable experience for users with browsers not supporting it yet.
In other words, don’t include critical information or functionality in the new styling that isn’t available in the underlying plain select element! But such is always a good practice anyway.
Very nice to see this taking shape though! Should be a huge improvement over the div monster that custom select box replacements often are. :)
[1] https://caniuse.com/mdn-css_properties_appearance_base-selec...
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