When editing a html file eclim will default to validating the file when it is written. Any errors will be added to the current window’s location list (:help location-list) and their corresponding line number noted via Vim’s sign functionality.
If you do not want your html files validated automatically when saved, you can set the g:EclimHtmlValidate variable described in the configuration section below.
Whether or not auto validation has been enabled, eclim also exposes the command :Validate to manually execute the validation of the file.
Vim Variables