Re: [WICG/webcomponents] [declarative-custom-elements] do we need DOM parts or any template mechanism in spec? (Issue #1090)

To answer some of #1009 questions:

* Declaration

    * How are attributes and properties declared?  **do they need declaration?**
    * How are styles declared? **`<link rel="stylesheet">` inline inside the template, it should be possible to inherit parent styles**
    * Are registrations always global, or can they be scoped? **scoped seems better to prevent grandchildren custom elements to conflict** 

* Scripting
      
    * Do declarative custom elements run with JavaScript disabled? **yes**
    * Will HTML Modules be importable from HTML with JavaScript disabled? **yes**
    * What is the base class for a declarative custom element? Does it directly extend HTMLElement, or is there another class with shared behavior? **The same way that custom elements are enhanced seems a good thing, just the shadow root would already be attached**
    * Can a declarative custom element be enhanced with script? **yes with standard `customElements.define(...)`**    
        * How is that script associated with the element? **any `<script>` that is executed at the declaration time that used `customElements.define(...)`**
        * Must the script be inline, or can it be bundled? **both can work depending if the `<script>` tag has a `src` attribute**
        * Can the script be loaded late? Is there an upgrade-like step when it does? **yes, same as current custom elements**

* Lifecycle
      
    * How do elements detect changes to data? **through events**
    * When do element re-render? Synchronously or asynchronously? **good question**

* Templates : **templating is not performed by the user agent, all these concerns go away**

* Security
      
    * Do declarative custom elements introduce a script gadget vulnerability? **use same rules as with existing HTML?**
    * Is expression evaluation sanitized? **no templating to evaluate simple functions, either javascript is disabled and minimum templating is available through slots, or javascript is enabled by policy and anything javascript can do is possible**
    * **for the rest, there is no data binding to worry about**

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