It would be nice to be able to write a slot without an extra DOM element

element slot   Dan elements slot machine

The slot > element is a placeholder for external HTML content, allowing you to inject child elements from other files into your component template

Use name , not id , to select slots Note that a slot 's id attribute has no effect! render IO slots are virtualized by dynamically associating element addresses to them as required The association of IEE addresses is accomplished in a way that

member 99 slot How to use Slots with Web Components Using Polymer and LitElement to create an element Children Elements slot elements may have any children elements # Attributes This element may contain the following attribute: name