Note: it is not enough, at least in theory, to ensure that the customization in colorThemeInit.vm always prioritizes the $request.colorTheme and that all CSS resources are loaded with colorTheme in the parameters:

• style.less.vm it's actually compiled as part of the regular view actions, inside colorThemeInit.vm , here: colorThemeInit.vm#L124
• it's not realistic to make sure that $request.colorTheme is always present on the URL for all view actions.