Re: [w3c/webcomponents] [idea] Allow HTML Element attributes to accept any type of value, not just strings. (#519)

> Can you explain what you mean by "properties"? Maybe I don't understand? Do you mean regular JS properties? If so, plain JS properties aren't hooked into the HTML engine, that's the downside.

Yeah, I mean just regular JavaScript properties. And so what if they aren’t “hooked into the HTML engine”? You could simply read from an attribute and set a property:

```HTML
<my-element data-my-attribute="[1, 2, 3]"></my-element>
```
```JavaScript
class MyElement extends HTMLElement
{
    // ...
    attributeChangedCallback(name, o, n)
    {
        if(name === "data-my-attribute")
        {
            this.myProperty = JSON.parse(n);
        }
    }
}
```

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