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    <script>
    const f = (evt) => {
      console.info('APP:', evt.type, document.readyState);
    };
    window.addEventListener('load', f, false);
    document.addEventListener('readystatechange', f, false);
    </script>
    <script>
      document.addEventListener('DOMContentLoaded', () => {
        const script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = 'https://yastatic.net/share2/share.js';
        script.onload = () => {
          console.log('SHARE: load');
          Ya.share2('ya-share2', {});
        };

        document.head.appendChild(script);
      }, false)
    </script>
    <div class="ya-share2" data-services="collections"></div>
  

Console: