Chart Type for Anomaly Detection. Keywords: anomaly, outlier, spike, alert, detection, monitoring, deviation. Best Chart: Line Chart with Highlights. Secondary Options: Scatter with Alert. When to Use: Monitoring a time-series for outliers; alerting users to unexpected spikes or dips in operational data. When NOT to Use: Anomalies are predefined categories (use bar with highlight); real-time context without a pause control. Data Volume Threshold: Stream at ≤60fps with Canvas; batch: up to 10,000 pts; mark anomalies as a separate data layer. Color Guidance: Normal: #0080FF solid line. Anomaly marker: #FF0000 circle + filled. Alert band: #FFF3CD background zone. Accessibility: AA — Use shape marker (not color only) for anomaly points. Add text annotation per anomaly event.. A11y Fallback: Text alert annotation per anomaly; anomaly summary list panel alongside chart. Library: D3.js, Plotly, ApexCharts. Interactive Level: Hover + Alert.