---
description: API reference for rtk-virtualized-participant-list component (Web Components (HTML) Library)
title: rtk-virtualized-participant-list
image: https://developers.cloudflare.com/realtime/realtimekit/humans/ui-kit/api-reference/core/rtk-virtualized-participant-list/og.png?v=bb788f87c15d576e
---

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# rtk-virtualized-participant-list

Last updated Oct 19, 2026|Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/realtime/realtimekit/humans/ui-kit/api-reference/core/rtk-virtualized-participant-list/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

## Properties

| Property | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `bufferedItemsCount` | `number` | ✅ | - | Buffer items to render before and after the visible area |
| `emptyListElement` | `HTMLElement` | ✅ | - | Element to render if list is empty |
| `itemHeight` | `number` | ✅ | - | Height of each item in pixels (assumed fixed) |
| `items` | `Peer1[]` | ✅ | - | Items to be virtualized |
| `renderItem` | `(item: Peer1, index: number) => HTMLElement` | ✅ | - | Function to render each item |

## Usage Examples

### Basic Usage

```html
<rtk-virtualized-participant-list></rtk-virtualized-participant-list>
```

### With Properties

```html
<rtk-virtualized-participant-list>
</rtk-virtualized-participant-list>
```

```html
<script>
  const el = document.querySelector("rtk-virtualized-participant-list");

  el.bufferedItemsCount = 42;
  el.itemHeight = 42;
  el.items = [];
</script>
```

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