Double-click an edge to reset size to auto
The axis you click resets. The other axis stays put.
Left or right edge
resets width to auto
Hello world
360 × 120
1
Hello world
auto × 120
2
Top or bottom edge
resets height to auto
Hello world
260 × 200
1
Hello world
260 × auto
2
Hot edge — your double-click target
Resize cursor appears on hover
w × h
Live size readout
Selection corner handle