Exception in IE/Edge when attaching plot to virtual item 

It seems that IE/Edge throws the following exception

> unexpected call to method or property access

when you attach a plot to an item that is not a child element of document.body (e. g. when using Riot.js or React).
This happens because of a call to getComputedTextLength() which doesn’t seem to be supported for elements that are not child nodes of the body.
