chromium/third_party/blink/web_tests/paint/invalidation/background/background-image-paint-invalidation-small-document.html

<!DOCTYPE html>
<style>
body {
  background: url(../resources/ducky.png);
}
</style>
<!--
Test that setting a background image for a document with no size specified (and which is therefore empty) still fills the entire viewport.
See http://dev.w3.org/csswg/css-backgrounds/#the-background for the spec requiring this.
-->