Function getCheckboxElement

test/unit/dom/dom.js:511–514

        : null;

    const getCheckboxElement = el =>
      el.elt.firstElementChild.getElementsByTagName('input').length
        ? el.elt.firstElementChild.getElementsByTagName('input')[0]
        : null;

    test('should be a function', function() {
      assert.isFunction(mockP5Prototype.createCheckbox);