== elem ? 'summary-row summary-row-hilite' : 'summary-row'
            });
            [...document.querySelectorAll('.th-entry')].map(th => {
                th.className = th.dataset.system == elem ? 'th-entry th-entry-hilite' : 'th-entry'
            });
        });
        selector.addEventListener('mouseout', e => {
            [...document.querySelectorAll('.summary-row')].map(row => {
                row.className = 'summary-row'
            });
            [...document.querySelectorAll('.th-entry')]