Input Week
A week-and-year picker input (YYYY-Www). Delegates to the native browser week picker. Supports min and max week constraints.
Keyboard interaction
| Key | Action |
|---|---|
| Tab | Move focus to the week input. |
| Shift + Tab | Move focus away from the week input to the previous element. |
| Type digits | Enter week and year values directly into the focused segment. |
| Arrow Up / Down | Increment or decrement the currently focused week or year segment. |
| Enter | Open or close the native browser week picker dialog (Chromium only). |
Screen reader behaviour
The following ARIA attributes are managed internally by the component:
| Property | Value | Note |
|---|---|---|
aria-required | "true" when required is set | Communicates the required state to assistive technologies. |
aria-invalid | "true" when state="error" | Signals a validation failure. Paired with aria-describedby pointing at the error message. |
aria-describedby | ID of the message or description element | Links the error or description text to the input so screen readers announce it on focus. |
aria-label / aria-labelledby | From label prop | Associates the visible label with the inner <input type="week"> via Shadow DOM id association. |
Label association
The label is associated with the inner <input type="week"> via Shadow DOM id association. Screen readers announce the label and the selected week on focus.
Native week picker
Chrome and Edge provide a native week picker. Firefox and Safari fall back to a plain text input. For non-Chromium browsers, communicate the expected format (YYYY-Www, e.g. 2025-W24) via the description prop so users know what to type.
Required fields
required adds a visual asterisk and aria-required="true".
Validation state
state="error" sets aria-invalid="true" and links the error message via aria-describedby.
Focus management
delegatesFocus: true routes host focus to the inner input. Reduced-motion styles respect prefers-reduced-motion.
WCAG 2.2 compliance
1.3.1 Info and Relationships — APass
Label, required indicator, and error message are all programmatically associated with the input via ARIA attributes.
1.4.3 Contrast (Minimum) — AAPass
Input text and label foreground colours meet the 4.5:1 minimum contrast ratio against the field background in both themes.
2.1.1 Keyboard — APass
All functionality is operable via keyboard. Week and year segments are adjustable with arrow keys in Chromium-based browsers.
2.4.7 Focus Visible — AAPass
A visible focus ring is applied on keyboard focus using :focus-visible styles.
3.3.1 Error Identification — APass
When state="error", the error message is linked via aria-describedby so screen readers announce it on focus.
4.1.2 Name, Role, Value — APass
The inner <input type="week"> exposes correct name, role, and value to assistive technologies via delegated focus and ARIA labelling.
Best practices
- Reduced motion — all CSS transitions inside the shadow DOM respond to
prefers-reduced-motion: reduceand are suppressed automatically. - Browser support — Chrome and Edge provide a native week picker; Firefox and Safari fall back to a plain text input. Always provide a
descriptioncommunicating the expected format (YYYY-Www, e.g.2025-W24) for non-Chromium users. - Error messaging — always pair
state="error"with a meaningfulmessageprop. Colour alone is insufficient for users who cannot distinguish red from other colours.