Have you ever started typing into a form and had your browser suggest a saved value? HTML can help the browser decide which value belongs in which field. The autocomplete token bday-month is used for month of birth.
What bday-month tells the browser
Month of birth.
This is a hint, not an instruction to fill a value automatically. Browsers and password managers consider settings, saved data, permissions and other signals before offering suggestions.
Example form field
<form action="/example" method="post">
<label for="detail-field">Birth month</label>
<input id="detail-field" name="detail" type="text" autocomplete="bday-month" inputmode="numeric">
<button type="submit">Continue</button>
</form>Understanding the example
The autocomplete="bday-month" attribute labels this field for autofill. Its visible <label> still tells people what to type, and its name attribute determines the key sent when a form is submitted.
Store the meaning clearly, regardless of local month-name display.
Sensitive information deserves extra care. Use HTTPS, collect only what is needed, avoid logging secrets, and validate received data on the server. Payment card fields should generally use a compliant payment provider rather than custom storage.
Try it yourself
Save the example as an HTML file, and test the field with browser autofill enabled. Inspect the autocomplete value and compare it with the field label. Browser behavior depends on available saved information, so a missing suggestion is not necessarily an HTML mistake.
Common Beginner Mistakes
- Store the meaning clearly, regardless of local month-name display.
- Leaving out the visible label because the browser might autofill the field.
- Treating autofill suggestions as verified or safe data.
Key Takeaways
bday-monthdescribes month of birth.- Store the meaning clearly, regardless of local month-name display.
- Autocomplete helps users; it does not replace labeling, accessibility or validation.