How to apply <sp-color-area> in my plugin?

Photoshop UXP Plugin API
1

截屏2022-05-10 下午7.02.52
截屏2022-05-10 下午7.02.52658×500 15.6 KB

I put “” in my html file and no color area comes up in my plugin. Could someone help me out? What am I missing?

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Spectrum Web Components are not supported on UXP