Working with em-based widths can be baffling

These four paragraphs have the same number of characters, but because the letter M is fat and the letter I is skinny, different amounts of characters appear in each line:

M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

This is the exact same text, but now I’m using a monospace font:

M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

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matt

My name is Matt Wilson. I make websites for Kiwee to pay the bills. I live in Cleveland Heights, Ohio, with my wife and son.