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Component Lab / application-data / accessible-heatmap-grid

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Accessible heatmap grid

A compact two-dimensional density visualization implemented as a real table. Row and column headers establish context, while each value cell has an exact accessible label and focus tooltip.

Lab tested Responsive Dark mode
Version
1.0.0
Updated
2026-08-02
Dependencies
Zero
Preparing the interactive workbench…

Implementation field notes

Use accessible heatmap grid confidently.

The preview and source are only the starting point. Use these notes to decide where the component fits, preserve its accessibility contract, and verify the adapted result.

Good fit for

  • Usage calendars
  • Team activity
  • Service load maps

This heatmaps pattern works best when its purpose is clear in the surrounding page hierarchy.

Accessibility contract

  • A caption and table headers establish both data axes.
  • Every focusable value cell includes a full readable label.
  • Keyboard focus presents the same tooltip as pointer hover.

Integration plan

  1. Copy the standalone HTML and scoped CSS into an isolated page.
  2. Adapt low activity, medium activity, high activity, surface color through the Inspector.
  3. Keep the semantic markup intact while replacing the sample content.
  4. Review the result at 375, 768, 1024, and 1440 pixels before shipping.

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