let addMailToHeader = document.createElement("a"); addMailToHeader.href = "mailto:info@sintech.kz"; let addMailSpanToHeader = document.createElement("span"); addMailSpanToHeader.className = "telefon"; addMailSpanToHeader.textContent = "Email:"; addMailToHeader.appendChild(addMailSpanToHeader); addMailToHeader.textContent += "info@sintech.kz"; document.querySelector(".s11").appendChild(addMailToHeader);