Table 34-11 summarizes the operations on canvas widgets. In the table, $c is a canvas and $t represents a canvas tag or numerical object ID. In some cases, an operation only applies to a single object. In these cases, if a tag identifies several objects, the first object in the display list is operated on.
The canvas display list refers to the global order among canvas objects. New objects are put at the end of the display list. Objects later in the display list obscure objects earlier in the list. The term above refers to objects later in the display list.