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<script>

    document.addEventListener("DOMContentLoaded", () => {

        const formNIP = document.querySelectorAll('input[name=form-field-akxdvc]')[0];
        const formPostcode = document.querySelectorAll('input[name=form-field-vkfutb]')[0];
        if (formNIP && formPostcode) {
            console.log(formPostcode);
            console.log(formNIP);
            formNIP.setAttribute("pattern", "[0-9]{10}");
            formNIP.setAttribute("title", "Numer NIP musi mieć 10 cyfr");
            formPostcode.setAttribute("pattern", "[0-9]{2}-[0-9]{3}");
            formPostcode.setAttribute("title", "Niepoprawny format kodu pocztowego");
        }
    })

</script>