Describe the feature
I would love to have a gradient for the slider track.

Explain it's value / reasoning
I see them pretty often and then I could use this Range Slider for a color picker I'm building.

Additional context
This doesn't work to style the range slider background

:root {
--range-slider: linear-gradient(
to right,
hsl(0, 100%, 50%),
hsl(60, 100%, 50%),
hsl(120, 100%, 50%),
hsl(180, 100%, 50%),
hsl(240, 100%, 50%),
hsl(300, 100%, 50%),
hsl(360, 100%, 50%)
);
}

But this does:

:root {
--range-slider: green
}