allow user input node content as HtmlElement

[Jim-JZ-Chen]

so user can better modifier the node content

[fperucic]

ok, please use this.nodeInnerHTML instanceof HTMLElement instead of typeof this.nodeInnerHTML === "string" before using appendChild

We can merge when you make that change.

cheers

[fperucic]

and it would be nice to add the newly added options to the documentation branch