Re: [WICG/webcomponents] [DOM Parts] Add new declarative syntax and update iterative proposal (PR #1023)

@tbondwilkinson commented on this pull request.



> +  </section>
+</template>
+```
+
+## Names and Metadata
+
+Templating systems may need to serialize data about the nodes they are marking
+into the processing instructions. Or at the very least parts could be named so
+that they are easier to fetch.
+
+```html
+<div>{{email data="foo"}}</div>
+```
+
+This could be exposed on the imperative API to be consumed in JavaScript by
+application logic.

Oh yeah it's not clear, but the reason metadata is a string is not because we split the string, it's because you might actually have metadata in two places for the same part.

```
{{# metadata1}}foo{{/ metadata2}}
```

I'll call this out.

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