[whatwg/dom] About `element` element (#519)

HTMLElementElement such as:

```html
<element name="concat-card">
    <attribute name="name" type="string"/>
    <attribute name="age" type="number"/>
    <attribute name="mobile" type="string"/>
    <attribute name="address" type="string"/>
</element>

<contact-card name="John Smith" age="28" mobile="0086-10-123456" address="The Address"></contact-card>
```

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