Alert banner

Overview

Communicate a persistent page- or system-level condition. It converts domain state into an understandable, traceable and accessible interface contract.

When to use

Use HE/Alert banner when you need to communicate a persistent page- or system-level condition. Keep its role distinct from transport freshness, animal-health severity and model confidence.

Example

<div class="he-alert-banner" role="status"><span>i</span><div><b>Archive queued</b><p>Daily telemetry will synchronize when the connection returns.</p></div><button class="he-button he-button--sm he-button--secondary">Review</button></div>

Anatomy

Anatomy stays identical in Pasture and Atlantic. A responsive layout may wrap or stack parts, but reading order and focus order remain equivalent.

Variants and states

Accessibility

Use status for passive updates and alert only for urgent, time-sensitive conditions.

• Maintain a visible keyboard focus indicator and a logical focus sequence.
• Never rely on colour alone for operational, freshness or severity state.
• Keep touch targets at least 44 × 44 px unless the target is an inline text link.

Cross-platform contract

Related components