Chart
A Chart turns data into a picture. It can show comparisons, trends, ranges, or links.
A real example
A weekly line chart reveals a growing backlog. A table gives exact values for screen readers and audits.
Main parts
- 01Data marks
- 02Scales and axes
- 03Labels and legend
Use it when
State the question first. Then choose a chart that makes the needed comparison clear.
Do not use it when
Avoid 3D decoration, misleading axes, color-only differences, and charts that hide simple numbers.
Name used in code
scale + mark + axis + legend + data table Before you ship
Before release, check the page structure, keyboard access, visible focus, contrast, and zoom. Also check loading, empty, error, success, cancel, and reduced-motion states.
Outcome: Use Chart to solve this user need without losing the current context. User context: A weekly line chart reveals a growing backlog. A table gives exact values for screen readers and audits. Recommended pattern: Chart. Why it fits: State the question first. Then choose a chart that makes the needed comparison clear. Do not use it when: Avoid 3D decoration, misleading axes, color-only differences, and charts that hide simple numbers. Product requirements: Define the default, loading, empty, error, success, and recovery states. Keep user input. Give clear feedback after every action. Accessibility and resilience: Use semantic HTML, full keyboard access, and visible focus. Make the layout work when zoomed and support reduced motion. Follow the project’s current rules. Do not add a new UI library unless the project already uses it. Acceptance criteria: The main task works with keyboard only and at 320px width. Focus and status changes are announced. Check loading, failure, retry, cancel, and reduced-motion paths. Evidence and limits (evidence boundary): No single official standard controls the whole term. Its meaning may change across teams, platforms, or frameworks. Unknowns to confirm: Product wording, data source, analytics events, supported devices and languages, and platform limits.
Check this request
Review the current use of Chart. Definition: A Chart turns data into a picture. It can show comparisons, trends, ranges, or links. Release checks: Before release, check the page structure, keyboard access, visible focus, contrast, and zoom. Also check loading, empty, error, success, cancel, and reduced-motion states. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.