In most cases the author does not need to worry about these dependencies; Internet Explorer 5 handles most of these case automatically. This is done by mapping certain properties to a canonical property for purposes of dependency tracking. For instance, the canonical property for all width properties is offsetWidth. A dependency on clientWidth, width, posWidth, pixelWidth, currentStyle.width, or the width of the img element implies a dependency on offsetWidth.

Although Internet Explorer automatically handles implicit dependencies for the most obvious cases, there are still some cases where the dependency is more obscure. Because the actual property still fires a property change notification, the recalculation engine usually knows to reevaluate the expression. However circular expressions involving these properties can only be detected at run time (and not when the expression is set on the property). Probably the most complex dependency is on the clientHeight of a DIV. The final computed clientHeight of the DIV depends on the innerHTML, the margin properties, the padding properties, and of course the width.