When zooming, the page was moving up/down because the scroll position
wasn't being adjusted to account for the scale change.
Solution: Proportional scroll compensation
- Track old scale before applying new scale
- Calculate scale ratio (newScale / oldScale)
- Adjust scroll position: newScrollTop = oldScrollTop * scaleRatio
Example:
- At 100% zoom, scrolled to pixel 1000
- Zoom to 50%: content at pixel 1000 is now at pixel 500
- Adjust scroll to 500 to keep same content visible
Result:
- Page stays visually in the same place when zooming
- Content you're viewing remains stable
- No jumping or movement during zoom transitions
- Works at all zoom levels (50%-200%)
juanatsap
6372f293f3