Heartbeat indicator

Overview

Communicate device recency against a heartbeat expectation. It converts domain state into an understandable, traceable and accessible interface contract.

When to use

Use HE/Heartbeat indicator when you need to communicate device recency against a heartbeat expectation. Keep its role distinct from transport freshness, animal-health severity and model confidence.

Example

<div class="he-auto-cluster"><span class="he-heartbeat-indicator">Received 28 seconds ago</span><span class="he-heartbeat-indicator" data-state="missed">Missed · 8 minutes ago</span></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

Include relative and exact time, plus the threshold that determines delayed or missed.

• 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