componentWillMount with .getDOMNode() that isn't in document yet

[Gozala]

Currently there is no hook that would allow us to set attributes on the node before it's injected into a document. Which is unfortunate as there are some attributes in the wild that take effect only before element is injected into a document.

To workaround this I'm forced to replacing react injected nodes with clones on componentDidMount
https://github.com/Gozala/firefox.html/blob/react/js/element.js#L57-L61

It would be great if react could expose node that will be inserted during componentWillMount or added another hook where node will be provided.

[zpao]

Since we're using innerHTML and building up a string as we go, that's not currently possible. If we switched to using createElement it would be, but I think we'd like to keep that an implementation detail so we could conditionally switch (eg, it might be better to use createElement in modern Firefox but innerHTML in IE8).

I think the better solution will be to make sure our attribute support is more versatile.

[jimfb]

Which attributes need to be set before element injection in order to take effect?

Also, is the underlying issue that React doesn't let you set unknown/unrecognized attributes? If so, perhaps this is a duplicate of #2746

[sophiebits]

Closing due to inactivity, but we can discuss more if you still have an issue.