I think( and maybe i tested that, but i'm hot sure), that it works. The main method in this is `_findFirstDomDescendantAfter`, which find html element, which is in node tree next sibling of this new DomComponent, so it find's place, where should element of this DomComponent be placed. Then it uses `insertBefore` method of html element to place this element of DomComponent to correct place. 

Here element, which is in map `_nodeToElement` play no role. For now, it play no role anywhere, that they are "mounted" like this. If i remove line of code, which add key with not DomComponent component to `_nodeToElement`, it will work's. I just thought that it should be usefull sometime in future. 

But it is true, that for now, it just consume memory... I will remove that.