[Webkit-unassigned] [Bug 280807] :scope :state not work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=280807

--- Comment #4 from Karl Dubost <karlcow at apple.com> ---
<button id=btn>toggle content visible</button>
<my-element>
</my-element>

with 

@scope (my-element) {
  :scope:not(:state(open)) {
    display: none;
  }
}


and

customElements.define('my-element', class extends HTMLElement {
  constructor() {
    super();
    this.internals = this.attachInternals();
    this.innerHTML = 'content';
    btn.onclick = () => {
      if (this.internals.states.has('open')) {
        this.internals.states.delete('open')
      } else {
         this.internals.states.add('open')
      }
    }
  }
})

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