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chromium/third_party/blink/web_tests/compositing/backgrounds/local-background-expected.html 

<!DOCTYPE html>
<style>
div {
    background: green local;
    border: 50px solid rgba(0, 127, 0, 0.5);
    overflow: scroll;
    width: 200px;
    height: 200px;
}
</style>
<div></div>