• -rectangle command with width= option creates a "frame" layer to use as the extent of an SVG map by setting the size of the SVG viewport (an alternative to using -o fit-extent= option).
• [web] Map symbols scale as the map zooms when a frame layer is visible.
• [web] Draggable box tool resizes symmetrically with the shift key pressed.
• [web] Allow selected layer to be temporarily hidden (via layers menu).