We have to struggle in order to make our pages consistent in different browsers; even in different versions of the same browser.

Our developers have to learn a language to develop client side, and another one to develop the server side.

JavaScript is a polemic language—love it or hate it. For some developers it is not object-oriented (although it has OO capabilities) and is an interpreted language. One only has to forget to add a semicolon, or introduce a syntax error when typing a command, and our application may produce an execution time error.

HTML 5 only works in updated browsers. Could you imagine yourself telling your client something like, "Well, what you have to do is install the latest version of Chrome or IE on your 1,000 PCs. This is also applicable to your associate companies."

We have to mix business and presentation logic. We try to avoid going to the server, for instance, to make validations which do not require reading a database. That is to say, we mix the reading of an input or an HTML ComboBox with the realization of validations. For example, if the user chooses more than four high-end products and is a premium client, we can enable a special 10 percent discount. This causes serious trouble when changes are required in the page layout, even if they are insignificant.