File: overflow-clip-margin-border-radius.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: overflow-clip-margin with border-radius</title>
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#overflow-clip-margin">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#shadow-shape">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-radius">
<link rel="match" href="overflow-clip-margin-border-radius-ref.html">
<meta name="assert" content="
  “The overflow clip edge is shaped in the corners exactly the same way
  as an outer box-shadow with a spread radius of the same cumulative offset
  from the box’s border edge.”

  Note that the exact shape is under discussion (*), this test only asserts
  that the shapes are equal.
  (*) https://github.com/w3c/csswg-drafts/issues/7103
">
<style>
#outer {
  width: 50px;
  height: 50px;
  overflow: clip;
  border-radius: 25px;
  overflow-clip-margin: 100px;
  margin: 125px;
}
#inner {
  width: 50px;
  height: 50px;
  box-shadow: black 0 0 0 100px;
  background: black;
}
</style>
<div id="outer">
  <div id="inner"></div>
</div>