ContainsRect = function (rectA, rectB)
{
    //  Volume check (if rectB volume > rectA then rectA cannot contain it)
    if ((rectB.width * rectB.height) > (rectA.width * rectA.height))
    {
        return false;
    }

    return (
        (rectB.x > rectA.x && rectB.x < rectA.right) &&
        (rectB.right > rectA.x && rectB.right < rectA.right) &&
        (rectB.y > rectA.y && rectB.y < rectA.bottom) &&
        (rectB.bottom > rectA.y && rectB.bottom < rectA.bottom)
    );
}
Tests if one rectangle fully contains another.

@function Phaser.Geom.Rectangle.ContainsRect
@since 3.0.0

@param {Phaser.Geom.Rectangle} rectA - The first rectangle.
@param {Phaser.Geom.Rectangle} rectB - The second rectangle.

@return {boolean} True only if rectA fully contains rectB.