Using templates and slots - Web APIs | MDN - MDN Web Docs

mdn slot The slot> tag 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. Use the template>. The slot> tag 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. Use the template>

mdnslot login, Slots are identified by their name attribute, and allow you to define placeholders in your template that can be filled with any markup fragment you want when the element is used.