Some users are confused by the margin-box clipping oversized shapes.
Example of bug report:

Solution
Add a visual indicator of shape maximum surface (float area). Perhaps fade in the margin-box outline when shape extends beyond it. Fade it out when shape returns within constraints to avoid persistent visual clutter.
Some users are confused by the margin-box clipping oversized shapes.

Example of bug report:
Solution
Add a visual indicator of shape maximum surface (float area). Perhaps fade in the margin-box outline when shape extends beyond it. Fade it out when shape returns within constraints to avoid persistent visual clutter.