Re: [WICG/webcomponents] Form-associated custom elements: being a submit button (#814)

alexkeng left a comment (WICG/webcomponents#814)

@julienw
It seems there could be security concerns if `form` were writable and allowed to reference across the shadow boundary.

We have a [proposal](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/ElementInternalsType/explainer.md) that could address this issue. The solution would look like this:

```js
class MyButton extends HTMLElement {
  static buttonActivationBehaviors = true;
  #internals;

  constructor() {
    super();
    this.#internals = this.attachInternals();
    this.#internals.buttonType = "submit";    
}
```

would this work for you?

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