Accessibility and Localization

Keyboard

The chart canvas is focusable (Tab); while focused:

Key	Action
→ / ←	next/previous point of the first visible series (highlighting)
Esc	clear the highlight

The container gets role="img" and an aria-label from title.text; the highlighted point is announced to screen readers via a hidden aria-live region.

Localization

Built-in strings are overridden via locale.localeText:

Charts.create({
  ...,
  locale: {
    localeText: {
      loading: 'Loading…',
      noData: 'No data to display',
      downloadPng: 'Download PNG',
      resetZoom: 'Reset zoom',
    },
  },
});

Keys: loading, noData, renderError (overlays), downloadPng, resetZoom (context menu). Axis and legend texts come from your data and your formatters, so they need no separate localization — and neither do most tooltips.

A tooltip that takes a value apart is the exception: it has to name the pieces itself, and those names are the library's own words rather than yours. Those are keys too:

Series	Keys	Default
waterfall	waterfallTotal, waterfallCumulative	Total, Cumulative
box plot	boxPlotMax, boxPlotQ3, boxPlotMedian, boxPlotQ1, boxPlotMin	max, q3, median, q1, min
candlestick, OHLC	ohlcOpen, ohlcHigh, ohlcLow, ohlcClose	O, H, L, C
histogram over calendar bins	quarter	Q

locale: {
  localeText: {
    waterfallTotal: 'Итог',
    waterfallCumulative: 'Накопленный итог',
    boxPlotMedian: 'Медиана',
  },
},

A tooltip.renderer writes the whole tooltip and answers to no key at all.

Options

Option	Type	Description
locale.localeText	Partial<Record<LocaleKey, string>>	UI string overrides

LocaleKey keys: loading, noData, downloadPng, resetZoom, plus the tooltip keys above — the defaults live in DEFAULT_LOCALE.

Keyboard support (always on): arrow keys move the highlight across the series' points, Escape clears the highlight and the zoom. State is announced via an ARIA live region.