{#-
  Furo sidebar component: documentation version switcher.

  The container is rendered with the `hidden` attribute (display:none, zero space)
  and is revealed by docs/_static/version-switcher.js only after switcher.json
  (named by data-switcher-url) has been fetched and yielded at least one entry.
  Consequences of this contract:
    - JavaScript disabled  -> stays hidden (no empty box, no reserved space).
    - switcher.json 404/CORS/parse failure -> stays hidden.
    - successful load       -> JS fills the <select>, preselects the entry whose
      "version" equals data-current-version, and reveals the container.
-#}
<div class="phepex-version-switcher" hidden
     data-current-version="{{ phepex_current_version }}"
     data-switcher-url="{{ phepex_switcher_url }}">
  <label class="phepex-version-switcher__label">
    <span>Version</span>
    <select class="phepex-version-switcher__select"
            aria-label="Select documentation version"></select>
  </label>
</div>