Unsure if @betaWeb still maintains this, but if so:
When clicking on a flash message, this causes the next error: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node. Even on the demo/example site.
To fix this, we want to turn removeChild() into remove() so we can properly target all children of the flash container.
I could make a pull request for merging if you'd like? (or fork it anyway?)