Allow tangy inputs to work with native form element

[rjcorwin]

A recent update to Chrome allows Custom Elements to better behave with the native <form> element. For example, submit a <paper-input> in a <form> element and that form will not have picked up the data for that <paper-input>. That is true for all tangy inputs as well.

This is mentioned the Chrome 77 release video. I haven't been able to find documentation on it or a way to describe it to be able to check in caniuse.com.

https://www.youtube.com/watch?reload=9&v=S8aVB3IfOR4

[chrisekelley]

Here's the article he referenced that describes formAssociated:

https://web.dev/more-capable-form-controls/