I don't think it makes sense to shift the focus of the book - the topic that it serves (understanding the fundamental construction of JavaScript DOM libraries a

I don't think it makes sense to shift the focus of the book - the topic that it serves (understanding the fundamental construction of JavaScript DOM libraries and the trickier aspects of the JavaScript language) is one that is grossly underserved. The issues that jQuery tackles are still issues that are relevant to developers on the whole. I should note that while the book does tackle cross platform issues that isn't exclusively what it tackles - at least 1/2 of the book is on nothing but the JavaScript language, for example.