diff --git a/ui/TODO.otl b/ui/TODO.otl
index 3ddc72e4..60ede275 100755
--- a/ui/TODO.otl
+++ b/ui/TODO.otl
@@ -1,5 +1,5 @@
Priority work
- [_] 60% Preview II
+ [_] 66% Preview II
[X] 100% sorted images in ribbons
[X] 100% stage I: position the promoted/demoted image correctly
| and correct positioning on promote/demote
@@ -58,7 +58,7 @@ Priority work
[X] one (with zooming)
[X] single image mode with zooming
| ribbons are hidden
- [_] 25% cleanup UI
+ [_] 25% UI
[_] fix single image mode
| need to center the image correctly...
[_] 55% add screen buttons for all actions...
@@ -99,12 +99,15 @@ Priority work
[X] navigation
[_] 0% actions
[_] bug: shifting up to new ribbon pushes the current row down...
- [_] 12% optional features...
- [_] 25% drag/move action...
- [_] basic infrastructure
+ [_] 40% optional features...
+ [_] 80% drag/move action...
+ [X] basic infrastructure
[X] action: center current image
- [_] while zoomed more than the screen
- [_] while zoomed out (ribbon view)
+ [X] while zoomed more than the screen
+ [X] while zoomed out (ribbon view)
+ [_] 0% cleanup...
+ [_] disable click events while dragging
+ [_] check compatibility with gestures
[_] 0% native client
[_] android
[_] 0% misc
diff --git a/ui/experiment-ribbon-navigation-n-zoom-drag.html b/ui/experiment-ribbon-navigation-n-zoom-drag.html
new file mode 100755
index 00000000..f87f789e
--- /dev/null
+++ b/ui/experiment-ribbon-navigation-n-zoom-drag.html
@@ -0,0 +1,264 @@
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