Status

Alert

Communicates important non-blocking information and available actions.

implementedReference catalog.he-alert-bannerHeAlertBanner

Overview

Communicates important non-blocking information and available actions. Its semantic foundation is Status or alert region according to urgency. Source scope: Reference catalog.

This element maps to the existing alert-banner component contract.

Visual Example

Changes savedThe latest version is available.

When to Use

Use Alert when its semantic purpose matches the user task. Prefer native platform behavior, concise labels, predictable placement, and content that remains understandable without visual styling.

Do

Use the canonical element ID and semantic role.
Keep labels and state programmatically available.
Test the element with real content and every supported input modality.

Don't

Do not substitute a visually similar element with different semantics.
Do not add focusable descendants without a documented keyboard model.
Do not communicate state through color or motion alone.

Anatomy

1Written status

2Optional icon

3Supporting detail

4Optional action

Variants

neutralinformationsuccesswarningdanger

Variants preserve the same semantics and accessible name. Density changes never reduce the minimum interactive target.

States

defaultupdatingresolveddismissed

Focus-visible takes precedence over hover and selected styling. Loading and disabled behavior never silently remove essential information or recovery paths.

Behavior

Status is announced according to urgency; controls inside the status remain independently focusable. Web targets are at least 44 × 44 CSS pixels and Flutter targets are at least 48 × 48 dp.

Accessibility

Status or alert region according to urgency. The element exposes an accessible name, role, state, value, and result where applicable; retains visible 3:1 focus indication; supports 200% text scaling and 320 CSS pixel reflow; and preserves structure in forced-colors and reduced-motion modes.

Tokens

color.* semantic roles→component.alert-banner.*→.he-alert-banner

Spacing, sizing, typography, border, radius, icon, motion, focus, and color decisions resolve from canonical tokens. Element code does not contain arbitrary visual literals.

Web and Flutter API

Web

<div class="he-alert-banner">Alert</div>

Flutter

HeAlertBanner(
  child: const Text('Alert'),
)

ds-alert is a registry identifier only; this library does not register an autonomous custom element under that name. Use the mapped component or native semantic composition shown above.

When an element includes an icon, use the exact Tabler name and semantic size from Foundations · Iconography.

Status

implemented. The contract is registered, visually represented, and included in automated documentation and accessibility validation. This status describes contract coverage, not independent production certification.