Re: [webcomponents] Closed flag proposal breaks ability to audit and automate tests of web pages (#354)

That seems like a limitation of a specific browser testing framework. Also, you can quite reliably find elements that are visible and do not have a shadow root as follows:

```js
function isElementVisibleAndWithoutShadowRoot(element) {
    var document.createElement('span');
    span.textContent = 'some text';
    span.style.fontSize = '10px';
    span.style.display = 'inline';
    span.style.position = 'relative';
    // Add more styles to make it even more reliable.
    span.slot = '<some random string>';
    element.appendChild(span); // span will not be distributed to any slot if elements has a shadow root.
    var rect = span.getBoundingClientRect();
    return rect.width || rect.height;
}
```

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https://github.com/w3c/webcomponents/issues/354#issuecomment-162690993