Input Month
A month-and-year picker input (YYYY-MM). Delegates to the native browser month picker. Supports min and max month constraints.
Keyboard interaction
| Key | Action |
|---|---|
| Tab | Move focus to the month input. |
| Shift + Tab | Move focus away from the month input to the previous element. |
| Type digits | Enter month and year values directly by typing numeric values into the focused segment. |
| Arrow Up / Down | Increment or decrement the currently focused month or year segment. |
| Enter | Open or close the native browser month picker dialog. |
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="month"> via Shadow DOM id association. |
Label association
The label is associated with the inner <input type="month"> via Shadow DOM id association. Screen readers announce the label and the selected month on focus.
Native month picker
The component delegates to the browser's native month picker (Chrome / Edge). Users can navigate month and year segments with arrow keys or by typing. Safari renders a plain text input as a fallback — communicate the YYYY-MM format via the description prop for those users.
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. Month 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="month"> 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. - Safari fallback — Safari renders a plain text input instead of a native month picker. Always provide a
descriptioncommunicating the expected format (YYYY-MM) so users know what to type. - Error messaging — always pair
state="error"with a meaningfulmessageprop. Colour alone is insufficient for users who cannot distinguish red from other colours.