CodePen @codepen.io · Jun 2 slideVars (little npm package) gives you a nice little UI widget for controlling CSS --custom-properties. Zero config. Or, ya know, some config if you need it. codepen.github.io/slideVars/
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I created a bookmarklet page so folks can use this on any site with ease. codepen.io/editor/JackH...
This is exactly what I needed yesterday. Thanks!