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Describe the bug
A clear and concise description of what the bug is.

I'm using Preact and https://github.com/preactjs/preact-custom-element to define custom elements / web components. Using the part="..." attr throws the following error in vscode:

Property 'part' does not exist on type 'HTMLAttributes<HTMLDivElement>'.

To Reproduce

Sample code:

import register from 'preact-custom-element';
import styles from './styles.css';

export function CustomElement(props) {
  const styles = '...';
  return (
    <>
      <style>{styles}</style>
      <div part="container">
        {props.children}
      </div>
    </>
  );
}

register(CustomElement, 'custom-element', [], {shadow: true});

Expected behavior
What should have happened when following the steps above?

Is it possible to add the "part" attribute to HTMLAttributes?