This article explains how you can use the and elements to create a flexible template that can then be used to populate the shadow DOM of a. The slotted element appears, but then doesn't disappear when the dom-if becomes false. When working with Shadow DOM-enabled components, the element is a web platform native way to allow content projection into components. The slot is rendered correctly and everything appears to behave, except when flicking back and forth, once the earlier slot has been rendered. [HOST] › blog › introducing-shadow-dom-api. There are two kinds of slots: Named slots: