Input Tel
A telephone number input. Triggers the numeric keypad on mobile devices and supports autocomplete for phone numbers.
Keyboard interaction
| Key | Action |
|---|---|
| Tab | Move focus to the input. |
| Shift + Tab | Move focus away from the input to the previous element. |
| Type | Enter a telephone number directly into the field. |
| Enter | Submit the enclosing form (if any). |
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="tel"> via Shadow DOM id association. |
Label association
The label is associated with the inner <input type="tel"> via Shadow DOM label/id pairing. Use hideLabel when visual context makes the label redundant while keeping it for screen readers.
Input type semantics
type="tel" opens the telephone numeric keyboard on mobile devices. Unlike type="number", it accepts leading zeros and formatting characters (spaces, hyphens, parentheses), making it appropriate for phone numbers.
Required fields
required adds a visible asterisk and aria-required="true" on the inner input.
Validation state
state="error" sets aria-invalid="true" and links the error message via aria-describedby.
Focus management
delegatesFocus: true ensures host-level focus delegates to the inner input. Reduced-motion styles are applied via 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.
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="tel"> 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. - Mobile keyboards —
type="tel"activates a telephone-optimised numeric keypad on mobile devices, reducing input errors for phone number fields. - Error messaging — always pair
state="error"with a meaningfulmessageprop. Colour alone is insufficient for users who cannot distinguish red from other colours.