-a subset of the iTerm2 protocol, with specifications for what happens
-to the cursor, and more precise definitions of the
-"preserveAspectRatio" equivalent options.
+a subset of the iTerm2 protocol, with:
+
+* Specifications for what happens to the cursor.
+
+* More precise definitions of the "preserveAspectRatio" equivalent
+ options.
+
+* Explicit restriction to a Cell-based target region.
+
+* Definition that pixels not covered by image are set to the current
+ background color.