A system for providing a user interface includes a first element tag and a second element tag. The first element tag specifies a first element that is associated with a class of connectable elements and includes a first order indicator that specifies an order of the first element. The second element tag specifies a second element that is associated with the class of connectable elements such that the first element and the second element can be connected. The second element tag includes a second order indicator that specifies an order of the second element. The order of the first element and the second element are related such that, when the first element and the second element are connected, the first element remains connected to the second element when the second element is moved, and the first element is separated from the second element when the first element is moved.