`color` vs `value` attribute

When rewriting ``, I opted for a `color` attribute. However, I’m not so sure it was a good idea. `value` is far more common across HTML elements, and there are libraries and frameworks that work out of the box with elements that follow the convention of `.value` property + `input` event for user-initiated changes (e.g. Vue’s `v-model`). Also, `color` is a `Color`, so conceptually since the attribute is specifying a string, `value` seems more fitting.

So what about:
- `value` attribute, which gets reflected into a `value` property
- `color` property that contains a `Color` instance if `this.value` is a valid color, or `null` otherwise.

This would be across all components whose value is a color (``, ``, ``).