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

@rictic commented on this pull request.



> +
+Allowing `{{}}` inside an attribute works the same as a
+[partial attribute update](./DOM-Parts-Imperative.md#partial-attribute-updates),
+in that it will create an `AttributePart` for the entire attribute, but it will
+have multi-valued `value` property.
+
+```html
+<template>
+  <section>
+    <h1 id="name">{{}}</h1>
+    Email: <a id="link" href="mailto:{{}}">{{}}</a>
+  </section>
+</template>
+```
+
+The `AttributePart` for `href` would have `value` equal to `['mailto:', '']`.

Two motivating examples:

```html
  <div class="foo {{color}} bar"></div>
  <iframe src="https://partner.example.com/page?{{params}}">
```

In these cases, I think a user would expect that after updating these AttributePart's values, foo and bar would still be classes on the div, and the iframe would only load from the partner page.

If a library on top of template parts wants to update the attribute to a value that doesn't include the static strings (e.g. via a user level directive system, or when set to a magic value defined by the library), it could still do so by getting the element and attribute name off the part and calling imperative APIs.

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