Re: [WICG/webcomponents] [dom-parts] Declarative syntax for creating DOM Parts (Issue #1003)

Not to detract from the exciting proposal @EisenbergEffect has laid out that seems to address all concerns, but also seems to require significant changes to rendering by the browser, I suppose addressing @justinfagnani criticisms of my suggestion of the template element as not being semantically meaningful, I would suggest, as an alternative to processing instructions, we could use the already existing self-closing [meta tag](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta), which seems to already be used for search engines quite extensively, and already supports the itemprop attribute (and like processing instructions doesn't render anything).  

Unfortunately, unlike the template element, the table element spits it out:

```html
    <table>
        <tr>
            <meta name="hello">
            <td>hello</td>
        </tr>
    </table>
```

gets rendered as:

```html
<meta name="hello">
    <table>
        <tr>
            <td>hello</td>
        </tr>
    </table>
```

But if we are talking bold actions, maybe this could be changed, to behave more like the template element?

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