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Showing content from https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/slot below:

<slot>: The Web Component Slot element - HTML: HyperText Markup Language

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The <slot> 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.

This element includes the global attributes.

name

The slot's name. When the slot's containing component gets rendered, the slot is rendered with the custom element's child that has a matching slot attribute. A named slot is a <slot> element with a name attribute. Unnamed slots have the name default to the empty string. Names should be unique per shadow root: if you have two slots with the same name, all of the elements with a matching slot attribute will be assigned to the first slot with that name.

<template id="element-details-template">
  <style>
    details {
      font-family: "Open Sans Light", Helvetica, Arial, sans-serif;
    }
    .name {
      font-weight: bold;
      color: #217ac0;
      font-size: 120%;
    }
    h4 {
      margin: 10px 0 -8px 0;
      background: #217ac0;
      color: white;
      padding: 2px 6px;
      border: 1px solid #cee9f9;
      border-radius: 4px;
    }
    .attributes {
      margin-left: 22px;
      font-size: 90%;
    }
    .attributes p {
      margin-left: 16px;
      font-style: italic;
    }
  </style>
  <details>
    <summary>
      <code class="name">
        &lt;<slot name="element-name">NEED NAME</slot>&gt;
      </code>
      <span class="desc"><slot name="description">NEED DESCRIPTION</slot></span>
    </summary>
    <div class="attributes">
      <h4>Attributes</h4>
      <slot name="attributes"><p>None</p></slot>
    </div>
  </details>
  <hr />
</template>

Note: You can see this complete example in action at element-details (see it running live). In addition, you can find an explanation at Using templates and slots.

• HTML <template> element
• HTML slot attribute
• CSS ::slotted pseudo-element
• CSS :has-slotted pseudo-class
• CSS scoping module

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