select-multi.md
In inshiny: Compact Inline Widgets for 'shiny' Apps

select is stable

Code
  cc(inline_select("select_id", list(`Dog names` = c("Fido", "Rex"), `Cat names` = c(
    "Felix", "Boots")), selected = "Rex", multiple = TRUE, meaning = "Select a pet name"))
Output
  <span class="inshiny-sel-container">
    <div class="inshiny-sel">
      <select id="select_id" class="shiny-input-select" multiple="multiple" aria-label="Select a pet name"><optgroup label="Dog names">
  <option value="Fido">Fido</option>
  <option value="Rex" selected>Rex</option>
  </optgroup>
  <optgroup label="Cat names">
  <option value="Felix">Felix</option>
  <option value="Boots">Boots</option>
  </optgroup></select>
      <script type="application/json" data-for="select_id">{"plugins":["selectize-plugin-a11y"]}</script>
    </div>
    <span class="inshiny-sel-spacer" style="width: 500px"></span>
  </span>