[jasonpriestley]

My practice is to build the DOM programmatically with jQuery, and add styles to the elements directly

   $("<div>")
     .css({width: 100, height: 20, color: 'red'})
     .appendTo(container);

Then, since these are just values in normal javascript code, you can refactor as normal. Pull commonly used patterns out into functions (e.g. `importantText(16, "size 16 important text goes here")`).

Most styles in the applications I write tend to be inextricably linked to the layout and function of a component (e.g., tabs should be next to each other); in the rare case that a style needs to be customized in different locations or at different times, it becomes a parameter (e.g. `confirmDialog(textStyle, message, onOk, onCancel)`)

No extra tools are needed, beyond jQuery (building up the DOM without jQuery or something like it is awful).