React and legacy/custom elements/attributes

[nfroidure]

I noticed that legacy attributes like align, cellpadding, cellspacing wasn't rendered by React (at least on the server side).

It is annoying for me since i was trying to convert our email templating system to use React in order to be able to display them in our frontend app.

The fact is that i'm unable to complete this task with React. It led to another question. How am i supposed to make React and WebComponents work together if custom element/attributes names are filtered by React rendering engine ?

[jimfb]

Currently, unknown attributes don't get passed down to DOM nodes. This is because things like transferring props (https://gist.github.com/sebmarkbage/a6e220b7097eb3c79ab7) would result in too many unknown/noisy properties being passed to the DOM elements.

We're aware of the issue, and a solution to the unknown-attribute issue is on the todo list.

Duplicate of: #140