Displays conversational content in a message bubble. Supports variants, alignment, grouping, reactions, and collapsible content.
Epicenter
Local-first, open source apps
The Bubble component displays framed conversational content. Use it for chat text, short structured output, quoted replies, suggestions, and reactions.
For full-featured chat interfaces, use the Message component. Bubble is intentionally scoped to the bubble surface. Place avatars, names, timestamps, metadata, and message-level actions in Message.
Installation
Copy and paste the following code into your project.
Usage
<script lang="ts">
import * as Bubble from "$lib/components/ui/bubble/index.js";
</script><Bubble.Root>
<Bubble.Content>
I checked the registry output and removed the stale route.
</Bubble.Content>
<Bubble.Reactions>
<span>👍</span>
</Bubble.Reactions>
</Bubble.Root>Composition
Use the following composition to build a bubble:
Bubble.Root
├── Bubble.Content
└── Bubble.ReactionsUse Bubble.Group to group consecutive bubbles from the same sender:
Bubble.Group
├── Bubble.Root
│ └── Bubble.Content
└── Bubble.Root
└── Bubble.ContentFeatures
- Seven visual variants, from a strong primary bubble to unframed ghost content
- Start and end alignment for sender and receiver bubbles
- Reactions that anchor to the bubble edge with configurable side and alignment
- Bubbles size to their content, up to 80% of the container width
- Polymorphic content via the
childsnippet for link and button bubbles - Customizable styling through the
classprop on every part
Variants
Use variant to change the visual treatment of the bubble.
A bubble sizes to its content, up to 80% of the container width. The ghost variant removes the max-width so assistant text and rich content can span the full row.
Alignment
Use align on Bubble.Root to align the bubble to the start or end of the conversation.
Note: When building chat interfaces, you probably want to use alignment on the Message component itself, not the Bubble component.
Bubble Group
Use Bubble.Group to group consecutive bubbles from the same sender. Note the align prop should be set on the Bubble.Root component itself, not the Bubble.Group component.
Bubble.Group
├── Bubble.Root
│ └── Bubble.Content
└── Bubble.Root
└── Bubble.ContentLinks and Buttons
You can turn a bubble into a link or button by using the child snippet on Bubble.Content.
<script lang="ts">
import * as Bubble from "$lib/components/ui/bubble/index.js";
</script>
<Bubble.Root variant="muted">
<Bubble.Content>
{#snippet child({ props })}
<button {...props}>Click here</button>
{/snippet}
</Bubble.Content>
</Bubble.Root>Reactions
Use Bubble.Reactions for bubble reactions. You can use it to display reactions or quick action buttons. Use side and align to position the row. side="top" anchors it to the upper edge. Reactions overlap the bubble edge, so leave vertical space between rows. The examples below use a larger gap for this reason.
Show More / Collapsible
Long bubble content can be composed with Collapsible to allow for a show more or show less interaction. Use the Collapsible.Trigger component to trigger the collapsible content.
Tooltip
Wrap a bubble in a Tooltip to reveal metadata on hover, such as when a message was read.
Popover
Pair a bubble with a Popover to surface more information on demand, such as the full error message for a failed action.
Accessibility
Bubble renders the presentational message surface. Keep conversation-level semantics on the surrounding container and follow the guidelines below.
Labeling Reactions
Reactions render as a row of emoji. A screen reader reads each glyph with no context, and counters like +8 are announced as "plus eight". Group the row as a single image with a descriptive aria-label so it announces once. role="img" also hides the individual emoji from assistive tech, so no aria-hidden is needed.
<Bubble.Reactions
role="img"
aria-label="Reactions: thumbs up, fire, and 8 more"
>
<span>👍</span>
<span>🔥</span>
<span>+8</span>
</Bubble.Reactions>When reactions are interactive, render buttons instead and give icon-only buttons an aria-label.
<Bubble.Reactions>
<Button aria-label="Thumbs up" variant="secondary" size="icon-xs">
<ThumbsUpIcon />
</Button>
</Bubble.Reactions>Interactive Bubbles
When a bubble is clickable, render it as a real <button> or <a> with the child snippet so it is focusable and exposes the correct role. Bubble.Content ships a visible focus ring for interactive elements, and the accessible name comes from the bubble text. No extra label is needed.
<Bubble.Root variant="muted" align="end">
<Bubble.Content>
{#snippet child({ props })}
<button type="button" {...props} onclick={onReply}>
I forgot my password
</button>
{/snippet}
</Bubble.Content>
</Bubble.Root>Meaning Beyond Color
Bubble variants signal role and tone with color. Pair them with text, alignment, or icons so meaning is not conveyed by color alone. For a destructive bubble, keep the error context in the message text rather than relying on the color treatment.
API Reference
Bubble
The root bubble wrapper.
Bubble.Content
The bubble content wrapper.
Bubble.Reactions
Displays overlapped reactions for a bubble.
Bubble.Group
Groups consecutive bubbles from the same sender.