Build a profile form that remains understandable by keyboard and screen-reader users when validation fails.

• Use native labels and buttons.
• Associate each error with its input.
• Do not rely on color alone.
• Expose submission progress without disabling editable fields.

I keep values controlled, derive errors on submit, and focus a summary only when errors appear. Native form semantics carry most keyboard behavior without custom key handlers, while a form-level error keeps failed saves recoverable.

export function ProfileForm() {
  const [values, setValues] = useState({ name: "", email: "" });
  const [errors, setErrors] = useState<Record<string, string>>({});
  const [formError, setFormError] = useState<string | null>(null);
  const [pending, setPending] = useState(false);
  const summaryRef = useRef<HTMLDivElement>(null);

  async function submit(event: FormEvent) {
    event.preventDefault();
    const next = validateProfile(values);
    setErrors(next);
    setFormError(null);
    if (Object.keys(next).length) {
      requestAnimationFrame(() => summaryRef.current?.focus());
      return;
    }
    setPending(true);
    try {
      await saveProfile(values);
    } catch {
      setFormError("Profile was not saved. Review your values and try again.");
      requestAnimationFrame(() => summaryRef.current?.focus());
    } finally { setPending(false); }
  }

  return <form onSubmit={submit} noValidate>
    {(Object.keys(errors).length > 0 || formError) &&
      <div ref={summaryRef} tabIndex={-1} role="alert">
        {formError ?? "Please fix the highlighted fields."}
      </div>}
    <label htmlFor="name">Name</label>
    <input id="name" value={values.name} aria-invalid={!!errors.name}
      aria-describedby={errors.name ? "name-error" : undefined}
      onChange={e => setValues(v => ({ ...v, name: e.target.value }))} />
    {errors.name && <p id="name-error">{errors.name}</p>}
    <label htmlFor="email">Email</label>
    <input id="email" type="email" value={values.email} aria-invalid={!!errors.email}
      aria-describedby={errors.email ? "email-error" : undefined}
      onChange={e => setValues(v => ({ ...v, email: e.target.value }))} />
    {errors.email && <p id="email-error">{errors.email}</p>}
    <button disabled={pending}>{pending ? "Saving" : "Save"}</button>
  </form>;
}

The component uses native semantics and one controlled state object. Focus moves only after failed submission, avoiding disruptive focus changes while typing.

• Only one field is invalid.
• Save rejects after valid client input.
• The user corrects an error.
• Submission is triggered by Enter.

• Test through labels and roles rather than CSS selectors.
• Assert summary focus after submit.
• Assert values survive failure.

• Using placeholders as labels.
• Rendering errors without associations.
• Moving focus on every keystroke.
• Disabling the entire form and blocking review.