This API feels a bit weird to me, but I understand it reflects the native <meter> element.
I think I wouldn't set the default value for optimum if not provided and not set the data-optimum attribute in this case.

Sounds good, it does seem a bit arbitrary anyway

Have we considered going beyond the native meter capabilities and allow custom ranges? I can think of a gauge that has a preferable range in the middle. A bit lower and a bit higher would be less preferable (yellow) and the extremes on both sides could be red. The built-in range doesn't support such a scenario (but on the other hand is simpler to use in more common cases)

I can think of a gauge that has a preferable range in the middle. A bit lower and a bit higher would be less preferable (yellow) and the extremes on both sides could be red. The built-in range doesn't support such a scenario

@michaldudak This still sounds like a normal numeric range just with different styling?

The "preferable range" is still the middle segment of among 3 segments, sandwiched by 2 non-preferable ranges on each end

And it could be styled with a gradient that goes red (0%) > yellow > green (~middle) > yellow > red (100%)

.indicator {
  background: linear-gradient(to-right, red 0%, yellow 25%, green 50%, yellow 75%, red 100%);
}