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: The Web Component Slot element\n\n The HTML element part of the Web Components technology suite is a placeholder inside a web component that you can fill with your own markup, which lets you create separate DOM trees and present them together.
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ContentSlots like Header and Footer are supposed to look the same on every Page. So they are defined for a PageTemplate. ContentSlots like the main content of a Page (e.g. the terms and conditions) may vary for each Page. So they are defined for a Page.