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Currently the MapSize is only taken from the mapfile, and not from the Map widget, on load. The MapSize widget parameter is currently inactive
this is likely a configuration error in the application template, the MapDHTMLWidget has a parameter ALLOWRESIZE, which if it is set to FALSE then the size in the mapfile is ignored and if set to TRUE then the size in the template is ignored. You need to determine which one is appropriate for your application. But even if you set ALLOWRESIZE to TRUE, the width and height parameters are mandatory (even though they are essentially ignored). I suggest that if this is important, a new enhancement bug be opened to modify the behaviour of the MapDHTMLWidget, or possibly to enhance how widget parameters are marked as mandatory/optional to allow for parameters to be mandatory/optional depending on the value of another parameter.