in 2.x and 3.x the Add Shortcode button uses ThickBox which comes preloaded in WordPress edit post pages as it's used by the Media Uploader.
ThickBox is old as a dinosaur and it has been mangled for internal WordPress purposes anyway. A lot of people writing media buttons hack ThickBox to add buttons next to Add Media button in the Editor.
Not urgent, but in future it'd be better to replace this with another modal and lightweight jQuery plugin, perhaps Magnific Popup.
in 2.x and 3.x the Add Shortcode button uses ThickBox which comes preloaded in WordPress edit post pages as it's used by the Media Uploader.
ThickBox is old as a dinosaur and it has been mangled for internal WordPress purposes anyway. A lot of people writing media buttons hack ThickBox to add buttons next to
Add Media
button in the Editor.Not urgent, but in future it'd be better to replace this with another modal and lightweight jQuery plugin, perhaps Magnific Popup.