pattern-library checked
U.S. Web Design System Site Alert Component
Documents site alerts for urgent sitewide information, critical system notifications, every-page display, full-width top placement, avoiding stacked alerts, restrained emergency color, labelled regions, and ARIA role choice for dynamic updates.
Pattern Decisions This Source Supports
| Pattern | Supported decision | Required contract | Claim note |
|---|---|---|---|
| Site alert | Choose site alert when urgent sitewide information must appear by default on every affected page near the top of the site. | The site alert appears before ordinary page content and is reachable from any affected route, not just the home page. | USWDS defines site alerts for urgent sitewide information, critical system notifications, every-page display, full-width top placement, stacking avoidance, color restraint, labelled regions, and dynamic ARIA roles. |
Evidence Role
This source is treated as pattern-library evidence. Use it to validate the decision rules above, not as a visual style reference.
Publisher: U.S. Web Design System. Last checked: .