[w3c/webcomponents] How to avoid memory leaks when detecting custom elements? (#674)

For example,

```js
            if (elementName.includes('-')) {
                customElements.whenDefined(elementName).then(() => {
                    console.log('          --- element defined:', elementName)
                })
            }
```

I don't know if an element will be a custom element, but in order to try to detect this, it seems that I will leak memory due to promises that are never resolved. I don't know the names of the custom elements either, they are arbitrarily defined and can be different for every app.

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