Called whenever draggable regions for the browser window change. These can
be specified using the '-webkit-app-region: drag/no-drag' CSS-property. If
draggable regions are never defined in a document this function will also
never be called. If the last draggable region is removed from a document
this function will be called with an NULL vector.
Called whenever draggable regions for the browser window change. These can be specified using the '-webkit-app-region: drag/no-drag' CSS-property. If draggable regions are never defined in a document this function will also never be called. If the last draggable region is removed from a document this function will be called with an NULL vector.