<!doctype html> <html lang=en> <meta charset=utf-8> <title>CSS-UI test: outline-offset width negative values — long box</title> <link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net"> <meta name=flags content="should"> <meta name=assert content="Negative values on outline-offset should not cause the height and the width of outside of the shape drawn by the outline to become smaller than twice the computed value of the outline-width property, applying this constrain independenly in each direction."> <link rel="match" href="../reference/ref-filled-green-100px-square.xht"> <link rel=help href="https://drafts.csswg.org/css-ui-3/#outline-props"> <style> div { width: 100px; height: 100px; /* The borders makes the box rectangular rather than square */ border-top: solid white 50px; border-bottom: solid white 50px; background: red; outline: solid 50px green; outline-offset: -100px; margin-top: -50px; } </style> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div></div>