Re: [w3c/webcomponents] HTML parser: align custom elements with the template element (#630)

I think this is easy to dismiss, but `<p>` for example, is a very commonly used tag that often contains more than text - images and videos in it. 

```html
<p>
  <my-element>
    <div>caption</div>
  </my-element>
</p>
```
gets parsed as:
```html
<p>
  <my-element>
  </my-element>
</p>
<div>caption</div>
```

I don't like the idea of not being able to create inline custom-elements inside a paragraph. For example, a custom picture or video element. 

Even if the output was the following, it would have worked for most cases:
```html
<p>
</p>
<my-element>
  <div>caption</div>
</my-element>
```
 
There may be no appetite to change the HTML parser, but if you are thinking of Web Components, this is pretty sucky behavior. 


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