getContainerDimensions.js

function getContainerDimensions(elements, container){
    // Returns an object { top: ..., right: ..., bottom: ..., left: ... }
    // so that the dimensions will cover all of `elements`
    //
    // `container` is the element that the dimensions are relative to

    return Seq.from(elements)
        .invoke('getDimensions', container)
        .pluck('top', 'right', 'bottom', 'left')
        .unzip().apply(function (tops, rights, bottoms, lefts){
            return {
                'top': tops.min(),       'right': rights.max(),
                'bottom': bottoms.max(), 'left': lefts.min()
            };
        });
}