A computer implemented method of editing a layout of areas on a page, for example for webpage design, includes displaying the layout in a user interface along with control elements operable via a user input device to manipulate user-variable attributes of the layout, the user-variable attributes including at least one of a number count of subdivisions in said layout, dimensions of said subdivisions in said layout, and border direction between each pair of adjacent subdivisions in said layout. Input via the user input device and the control elements is received to modify one or more of the user-variable attributes. Stored data representing the layout is updated based on the user input, and the display of the layout is updated based on the updated data to present a revised layout based on new values of the user-variable attributes.