$(document).ready(function () {
    $('.wikitable.item').each(function () {
        var currentTable = $(this);
        var cells = currentTable.find('td, th');

        cells.hover(function () {
            var $this = $(this);
            var columnIndex = $this.index();
            var rowIndex = $this.parent().index();

            $this.parent().find('td, th').addClass('highlight-cell');

            cells.filter(function() {
                return $(this).index() === columnIndex;
            }).addClass('highlight-cell');

            if ($this.attr('colspan')) {
                var colspan = parseInt($this.attr('colspan'));
                for (var i = 0; i < colspan; i++) {
                    cells.filter(function() {
                        return $(this).index() === columnIndex + i;
                    }).addClass('highlight-cell');
                }
            }

            if ($this.attr('rowspan')) {
                var rowspan = parseInt($this.attr('rowspan'));
                for (var i = 0; i < rowspan; i++) {
                    currentTable.find('tr').eq(rowIndex + i).find('td, th').addClass('highlight-cell');
                }
            }
        }, function () {
            cells.removeClass('highlight-cell');
        });
    });
});

.highlight-cell {
    background-color: var(--background-color-quiet--hover) !important;
}