Function getCenter

src/mapml/handlers/ContextMenu.js:880–884

(el)

      // while gecko returns an object (for e.originalEvent).
      if (Browser.gecko) {
        const getCenter = function (el) {
          let w = el.getBoundingClientRect().width;
          let h = el.getBoundingClientRect().height;
          return { x: Number.parseInt(w / 2), y: Number.parseInt(h / 2) };
        };
        pt = getCenter(this._map.getContainer());
      }
      this._container.removeAttribute('hidden');