How to Use the slot Element in HTML - Front-end Reference

The Buttons component is a container element Buttons placed in a toolbar should be inside the ion-buttons element and can be positioned using named slots

element When enabled, this allows the use of named slot> elements to forward the Custom Element's children to specific places in the shadow tree function

elements the awakening slot Learn how to work with slots to work with the concept of dynamic slot placeholders in your custom elements

element slot A Complication Slot is an area of the watch face that a Complication can be added by the user Complication Slots contain Complication elements,