docuseal/app/views/scripts/_autosize_field.html.erb

<script>
  if (!window.customElements.get('autosize-field')) {
    window.customElements.define('autosize-field', class extends HTMLElement {
      connectedCallback() {
        if (this.field.scrollHeight > this.field.clientHeight) {
          this.field.classList.remove('text-[1.6vw]', 'lg:text-base');
          this.field.classList.add('text-[1.0vw]', 'lg:text-[0.70rem]');

          if (this.field.scrollHeight > this.field.clientHeight) {
            this.field.classList.add('text-[0.8vw]', 'lg:text-[0.50rem]');
          }
        }
      }
      get field() {
        return this.closest('field-value');
      }
    });
  }
</script>