css/css-ui/outline-014.html

<!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-right: solid white 50px;
  border-left: solid white 50px;
  background: red;
  outline: solid 50px green;
  outline-offset: -100px;
  margin-left: -50px;
}
</style>

  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
  <div></div>