he/him 
I'm pretty sure that's the only way to do it. If there is a different way, @danfreedman might know.
What's the best way to test for CSS variable support in JS? So far everything I've seen relies on actually setting and testing the styles of an element.
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window.CSS.supports('box-shadow: 0 0 0 var(--foo') in JS or
@supports() that string in CSS is my go-to. - 2 more replies
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Are you talking about browser support or support inside JS?
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