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

<script id="autosize_script" nonce="<%= content_security_policy_nonce %>">
  if (!window.customElements.get('autosize-field')) {
    window.customElements.define('autosize-field', class extends HTMLElement {
      connectedCallback() {
        const originalFontValue = this.field.style.fontSize

        if (this.field.scrollHeight > this.field.clientHeight) {
          this.field.style.fontSize = `calc(${originalFontValue} / 1.5)`;
          this.field.style.lineHeight = `calc(${this.field.style.fontSize} * 1.3)`;

          if (this.field.scrollHeight > this.field.clientHeight) {
            this.field.style.fontSize = `calc(${originalFontValue} / 2.0)`;
            this.field.style.lineHeight = `calc(${this.field.style.fontSize} * 1.3)`;
          }
        }
      }
      get field() {
        return this.closest('field-value');
      }
    });
  }

  window.autosize_script.remove()
</script>