Comment afficher une liste non ordonnée sur deux colonnes à l'aide de CSS et JavaScript ?

ul {
  columns: 2;
  -webkit-columns: 2;
  -moz-columns: 2;
}

<div>
    <ul class="columns" data-columns="2">
        <li>A</li>
        <li>B</li>
        <li>C</li>
        <li>D</li>
        <li>E</li>
        <li>F</li>
        <li>G</li>
    </ul>
</div>

(function ($) {
    var initialContainer = $('.columns'),
        columnItems = $('.columns li'),
        columns = null,
        column = 1; // account for initial column
    function updateColumns() {
        column = 0;
        columnItems.each(function (idx, el) {
            if (idx !== 0 && idx > (columnItems.length / columns.length) + (column * idx)) {
                column += 1;
            }
            $(columns.get(column)).append(el);
        });
    }
    function setupColumns() {
        columnItems.detach();
        while (column++ < initialContainer.data('columns')) {
            initialContainer.clone().insertBefore(initialContainer);
            column++;
        }
        columns = $('.columns');
    }

    $(function () {
        setupColumns();
        updateColumns();
    });
})(jQuery);

.columns {
    float: left;
    position: relative;
    margin-right: 20px;
}

A  E
B  F
C  G
D

A  B
C  D
E  F
G

function updateColumns() {
    column = 0;
    columnItems.each(function (idx, el) {
        if (column > columns.length) {
            column = 0;
        }
        $(columns.get(column)).append(el);
        column += 1;
    });
}