Requires Ahem font. The content flows into a region (300px wide) what contains a shape-inside rectangle (200px wide) with 50px left offset.
The content should fill the shape-inside area out. There should be an equally 50-50px left and right offset for the content in the content box. The borders shouldn't have any effect on the shape-inside's rectangle.

Bug 115456: [CSS Regions][CSS Exclusions] Shape-inside on regions should respect region borders and paddings