When you are adding pictures to your Wiki article, it's not always easy to plan for the size of it relative to the page.
By default, on the current platform a wiki page offers a limited width... In certain situation your picture will go off the grid.
To avoid that, you need to limit the width of pictures (also tables, code boxes, ...)
Just to show you some effects, we have taken the famous Wiki Ninja images from the TechNet WIKI Images gallery as example.
Normally, Wiki will autocorrect pictures, but that's not the case for tables.
It's up to you to detect where the pages go off grid...
Fixed: 100px
Fixed: 200px
Fixed: 300px
Fixed: 400px
Fixed: 500px
Fixed: 550px (default setting)
Fixed: 600px
Fixed: 700px
Fixed: 800px
Fixed: 1100px
Variable: 50%
Variable: 99%
Variable: 100%