site/_js/web-components/side-nav.js
/**
   * Called by IntersectionObserver with visibility changes.
   *
   * @param {boolean} visible
   */
Called by IntersectionObserver with visibility changes.
@param {boolean} visible
Called by IntersectionObserver with visibility changes . @param { boolean } visible
onVisibleChange(visible) {
    if (!visible) {
      collapseSideNav();
    }
  }
onVisibleChange ( visible ) { if ( ! visible ) { collapseSideNav ( ) ; } }
Called by IntersectionObserver with visibility changes.
Called by IntersectionObserver with visibility changes .