Bad value “telephone” for attribute “autocomplete” on element “input”: The string “telephone” is not a valid autofill field name.

The autocomplete attribute does not accept "telephone" as a valid value — the correct value is "tel".

The autocomplete attribute helps browsers autofill form fields with previously saved user data. Each field type has a specific token defined in the HTML specification. For phone numbers, the valid token is "tel", not "telephone". Other related tokens include "tel-country-code", "tel-area-code", "tel-local", and "tel-extension" for more granular phone number parts.

Using the correct token ensures that browsers can properly suggest stored phone numbers to users, improving the form-filling experience.

Invalid Example

<label for="phone">Phone number</label>
<input type="tel" id="phone" name="phone" autocomplete="telephone">

Valid Example

<label for="phone">Phone number</label>
<input type="tel" id="phone" name="phone" autocomplete="tel">

Learn more:

MDN Reference

HTML attribute: autocomplete

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WHATWG Spec

The input element

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web.dev Article

Forms in HTML

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