What is the Slot Element?

What You'll Learn

• How slots work in Web Components
• Named vs default slots
• Component composition

Understanding Slots

The <slot> element is a placeholder inside Web Components where external content gets inserted.

Key Concepts

• Default slot: Catches all unassigned content
• Named slots: Multiple insertion points
• Fallback content: Shown when no content provided

Example

<template id="card-component">
  <div class="card">
    <slot name="header">Default Header</slot>
    <slot>Default content</slot>
    <slot name="footer"></slot>
  </div>
</template>

<!-- Using the component -->
<my-card>
  <h2 slot="header">Custom Title</h2>
  <p>Main content goes here.</p>
  <button slot="footer">Click Me</button>
</my-card>

Why Use Slots?

• Create flexible, reusable components
• Allow custom content with encapsulated styling
• Build composable UI components