Nuxt Ui Guideline: Forms — Use validateOn prop for validation timing. Description: Control when validation triggers (blur change input). Do: validateOn="['blur']" for performance. Don't: Always validate on input. Good Example: <UForm :validateOn="['blur', 'change']">. Bad Example: <UForm> (validates on every keystroke). Severity: Low. Docs: https://ui.nuxt.com/docs/components/form.