<small>

<small> below form elements is muted and acts as helper text.

Use aria-describedby to associate it with the input.

Helper Text

<input
  type="email"
  name="email"
  placeholder="Email"
  autocomplete="email"
  aria-label="Email"
  aria-describedby="email-helper"
/>
<small id="email-helper">We'll never share your email with anyone else.</small>