In developer mode, two things happen:

• You get tooltips when hovering over a field in a form view or over a column in list view, providing technical information about the field (internal name, type, and so on)
• A drop-down menu with a Bug icon is displayed next to the user's menu in the top-right corner, giving access to technical information about the model being displayed, the various related view definitions, the workflow, custom filter management, and so on

There is a variant of the developer mode: the Developer mode (with assets). This mode behaves like the normal developer mode, but additionally, the JavaScript and CSS code that's sent to the browser is not minified, which means that the web development tools of your browser are easy to use for debugging the JavaScript code (more on this in Chapter 15, Web Client Development).