* Based on the global "highlight_from" and "highlight_to" variables.
*/
var update_board_highlight = function() {
- document.getElementById("board").querySelector('.square-55d63').classList.remove('nonuglyhighlight');
+ document.getElementById("board").querySelectorAll('.square-55d63').forEach((square) => square.classList.remove('nonuglyhighlight'));
if ((current_display_line === null || current_display_line_is_history) &&
highlight_from !== undefined && highlight_to !== undefined) {
document.getElementById("board").querySelector('.square-' + highlight_from).classList.add('nonuglyhighlight');