I found that setting the following variables makes it work. The variables are defined in web-mode and some people got very close by setting first and second but not the third one:
(setq web-mode-start-tag-regexp "<\\([[:alpha:].][[:alnum:].:_-]*\\|>\\)")
(setq web-mode-tag-regexp "</?\\([[:alpha:].][[:alnum:].:_-]*\\)")
(setq web-mode-dom-regexp "<\\(/?>\\|/?[[:alpha:].][[:alnum:].:_-]*\\|!--\\|!\\[CDATA\\[\\|!doctype\\|!DOCTYPE\\|\?xml\\)")
Maybe someone else can check it in her installation.
