The Proof
Your Text. Real Rendering.
No fabricated examples. Paste any paragraph, pick a real column width, and compare the browser’s greedy line breaking against the typeset engine — same text, same font, same width, both actually rendered in your browser. Every number below is measured from the lines you are looking at.
Column width — 375px
Typeface
Typeset engine375px
The dashed line marks the column edge — the shape of each right rag against it is the real comparison. Zero is not always achievable: at narrow measures some text physically cannot avoid every compromise without hyphenation, and the engine will choose the least damaging one.