_includes/search-providers/google-custom-search-engine/search.html

{%- if site.search.google.custom_search_engine_id -%}
  <div class="search search--dark search--google-custom-search-engine">
    <div class="main">
      <div class="content js-gcse">
        <!-- <gcse:search enableAutoComplete="true" gname="search-box"></gcse:search>
        <gcse:searchresults-only gname="results"></gcse:searchresults-only> -->
      </div>
    </div>
  </div>
  <script>
    var gcse = document.getElementsByClassName('js-gcse')[0];
    var gcseSearch = document.createElement('gcse:search');
    gcseSearch.setAttribute('enableAutoComplete', 'true');
    gcseSearch.setAttribute('gname', 'search-box');
    var gcseSearchresults = document.createElement('gcse:searchresults-only');
    gcseSearchresults.setAttribute('gname', 'results');
    gcse.appendChild(gcseSearch);
    gcse.appendChild(gcseSearchresults);
  </script>
  <script>{%- include search-providers/google-custom-search-engine/search.js -%}</script>
{%- endif -%}