css-color-functional-whitespace-syntax.html

<!DOCTYPE html>
<title>Support for functional (whitespace) syntax in CSS color</title>
<script>
    var values = [
        'rgb(0 128 255)',
        'rgb(0 128 255 / 0.5)',
        'hsl(198 28% 50%)',
        'hsl(198 28% 50% / 0.5)',
        'rgba(51 170 51 / 40%)',
        'hsl(.75turn, 60%, 70%)'
    ];
    for (var v of values) {
        document.writeln(v + " supported=" + CSS.supports('color', v) + "<br />")
    }
</script>