Draft for a button+dropdown using popover api + anchor api + react

Dropdown.tsx

import { useId } from 'react';

function Example() {
  const id = useId();

  return (
    <div style={{ position: 'relative' }}>
      <button
        // @ts-ignore TODO: Update to [email protected] (currently tested on ^18.2.0)
        popovertarget={id}
        popovertargetaction="toggle"
        style={{ paddingInline: 8, ['anchorName' as string]: '--popover-1' }}
        onClick={() => {
          // optionally do something else besides opening the dropdown
        }}
        onKeyDown={(event) => {
          const popoverEl = event.currentTarget
            .nextElementSibling as HTMLDivElement;
          if (event.key === 'Escape' && popoverEl.matches(':popover-open')) {
            // Prevent closing extension popup, close only popover
            event.preventDefault();
            popoverEl.hidePopover();
          }
        }}
      >
        button text
      </button>
      <div
        id={id}
        // @ts-ignore TODO: Update to [email protected]
        popover="auto"
        style={{
          position: 'absolute',
          ['positionAnchor' as string]: '--popover-1',
          margin: 0,
          top: 'anchor(bottom)',
          left: 'anchor(start)',
          border: 'none',
          backgroundColor: 'transparent',
        }}
        onKeyDown={(event) => {
          if (event.key === 'Escape') {
            // Prevent closing extension popup, close only popover
            event.preventDefault();
            event.currentTarget.hidePopover();
          }
        }}
      >
        <div>{/* dropdown menu content */}</div>
      </div>
    </div>
  );
}