[color-swatch] Add support for the label prop, closes #107
#171
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#107 seems to be a blocking issue for #167, so let's try to address it first.
This PR adds the
labelprop to<color-swatch>and the corresponding part for custom styling. As @LeaVerou suggested in #107, the implementation is inspired by the<option>element.There is no separate slot for the value of this attribute because I couldn't think of any use cases where it might be needed (I might miss something, though).
Live preview: https://deploy-preview-171--color-elements.netlify.app/src/color-swatch/#the-label-attribute