# FillWord (/docs/charts/fill-word)

FillWord answers "how far along is this named task?" by making the label _be_ the bar. A muted word is overlaid with an
accent copy of itself, clipped to the value fraction of the word's own inked extent — so 50% visually bisects the word.
The fill is a percentage of the glyphs you see, never of a hidden wider track. It trades some precision for a read that
needs no separate label.

```tsx
<FillWord word="uploading" value={0.62} title="Upload" fontSize={18} />
```

## Install

```tsx
import { FillWord } from "@microcharts/react/fill-word";

<FillWord word="uploading" value={0.62} />
```

Setup (package + stylesheet): [Quickstart](/docs/quickstart#set-up-with-an-ai-agent) or paste [`/agent-setup.md`](/agent-setup.md) into your agent.


## When to use it

- **Good for** — a labelled progress read in a sentence or cell, a sync/upload status where the label names the task, or
  a quota/TTL where the word is the metric.
- **Avoid for** — precise percentages (Progress), trends (Sparkline), or many parallel bars (MiniBar).


## Variants

```tsx
<FillWord word="expiring" value={0.7} mode="drain" />
<FillWord word="storage" value={0.4} label="value" />
```

## Edge cases

```tsx
<FillWord word="uploading" value={0} />
<FillWord word="uploading" value={1} />
```

At 0% the word is entirely the muted track; at 100% it is entirely accent ink — both ends are honest limits of the same
clip, not a special case.

```tsx
<FillWord word="" value={0.5} />
```

An empty `word` renders nothing and reports **"No data."** — there is no label to be the bar.


## Why this default

Fill (not drain) is the default because progress is the ninety-percent case — a word filling as a step completes.
`mode="drain"` empties the ink from the left as the value rises, the remaining-time story that fill cannot tell (TTLs,
expiring sessions). Because glyph ink is uneven, fine reads are ±5% — the fill edge lands between letters, not on an
exact tick. When you need the number, add `label="value"` for the percent alongside, or reach for `Progress` when
precision is the point.

## Accessibility

The accessible name names the task and its state — **"storage: 40% complete."** — or, in drain mode, where `value` is
the fraction already drained, **"expiring: 30% remaining."** for `value={0.7}`. An empty word reads "No data." The
interactive entry glides the ink edge with a reduced-motion-gated clip-path transition and announces changes through a
polite live region, throttled to at most once a second so a streaming value never spams.

This chart is a single unit, so there is nothing to rove between: a click, tap, `Enter` or `Space` selects it
and fires `onSelect`, and no selection stays pinned. That is the scalar half of the shared
[interaction contract](/docs/accessibility#one-interaction-contract).

## Props

| Prop | Type | Description |
| --- | --- | --- |
| `word` (required) | `string` | The text that is the chart. |
| `value` (required) | `number` | Fraction 0–1 (clamped). |
| `mode` | `"fill" \| "drain"` | fill grows the ink (complete); drain empties it (remaining / TTL). |
| `label` | `"none" \| "value"` | Append the percent numeral after the word. |
| `animate` | `boolean` | (interactive) Opt-in entrance motion when the chart mounts client-side — add `import "@microcharts/react/motion"` once. Inert on the server, on hydrated server HTML, and under `prefers-reduced-motion`. |

Plus the shared grammar — `data`, `domain`, `color`, `title`, `summary`, `format` — and the layout props (`width`, `height`, `className`, `style`) that every chart accepts. Interactive entries also share `animate` and `live`, and — wherever a chart has more than one navigable unit — `onActive`, `onSelect`, `selectedIndex` and `defaultSelectedIndex`; and — wherever the chart shows a hover value — `readout`. See [the shared grammar](/docs/quickstart#the-shared-grammar).