 dark)').matches ? 'photon-dark' :
                    'github-light';
            } else {
                utterancesTheme = utterancesTheme === 'dark' ? 'photon-dark' : 'github-light';
            }
            var s = document.createElement('script');
            s.src = 'https://utteranc.es/client.js';
            s.setAttribute('repo', '{{ .Site.Params.utterancesRepo }}');
            s.setAttribute('issue-term', '{{ .Site.Params.utterancesIssueTerm }}');
            s.setAttribute('theme', utterancesT