function toggleSANTruncation()
                {
                    if (sanDiv.classList.contains("truncated-san")) {
                        sanDiv.classList.remove("truncated-san")
                        truncatedSANToggle.textContent = WebInspector.UIString("Show less");
                    } else {
                        sanDiv.classList.add("truncated-san");
                        truncatedSANToggle.textContent = WebInspector.UIString("Show more (%d total)", sanList.length);
                    }
                }
@param {!NetworkAgent.CertificateSubject} certificateSubject
*return {!Element}