In the previous version of geojson.io you could very easily snap vertices of one polygon to those of another, making it simple to create polygons with shared borders. In the new version the only apparent way to snap is by pressing and holding ALT, but in this mode the tool does not snap to vertices, it snaps to the nearest point on a line. This makes it nearly impossible to cleanly (let alone quickly) create shapes that share a border without small misalignments, as you will usually end up selecting a point that isn't actually at the vertex. Please bring back the snapping mode from the original, or add a "snap to points" mode with a different keyboard modifier. It would be nice if there were a button in the UI to toggle snapping as well, as only being able to use it with a modifier key presents accessibility limitations.
In the previous version of geojson.io you could very easily snap vertices of one polygon to those of another, making it simple to create polygons with shared borders. In the new version the only apparent way to snap is by pressing and holding ALT, but in this mode the tool does not snap to vertices, it snaps to the nearest point on a line. This makes it nearly impossible to cleanly (let alone quickly) create shapes that share a border without small misalignments, as you will usually end up selecting a point that isn't actually at the vertex. Please bring back the snapping mode from the original, or add a "snap to points" mode with a different keyboard modifier. It would be nice if there were a button in the UI to toggle snapping as well, as only being able to use it with a modifier key presents accessibility limitations.