theme development

Initially I was using active callback to make my Customizer controls in nature, and was satisfied with the I had with it.   But then I cam across this article about Content-aware previews Customizer.   In that article, the author has used his own plugin to get the page value.   I got everything from JavaScript enqueued for the controls and the previews, what I did not get is what could be the page value for post or page or custom post type here. $page = Login Designer ->get login designer page.   Is anyone doing something similar with Customizer.   Please share how this can be doable with the different page types...   Read more