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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-size-cover-003.html 

<!DOCTYPE html>
<title>CSS Test: background-size: cover with zero-sized background positioning area.</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#valdef-background-size-cover">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4049">
<link rel="help" href=" https://bugzilla.mozilla.org/show_bug.cgi?id=1559094">
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="background-size-cover-003-ref.html">
<meta name="fuzzy" content="maxDifference=0-255;totalPixels=0-1">
<style>
body { margin: 0 }
div {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: top left;
  background-origin: content-box;
  background-image: url(/images/green-100x50.png);
}
#test1 {
  height: 0;
  width: 100px;
  padding-bottom: 100px;
}

#test2 {
  height: 100px;
  width: 0;
  padding-right: 100px;
}
#test3 {
  height: 0;
  width: 0;
  padding-right: 100px;
  padding-bottom: 100px;
}
</style>
<div id="test1"></div>
<div id="test2"></div>
<div id="test3"></div>