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chromium/third_party/blink/web_tests/images/transparent-gif-paint-background-expected.html 

<!doctype HTML>
<!doctype HTML>
<style>
img {
  display: block;
  background-color: blue;
}
</style>
Test passes if green is seen.
<div id="image" src="" style="background: green; width: 100px; height:100px"/>