background-blend-mode-body-transparent-color-and-image.html

<!DOCTYPE HTML>
<style>
body { 
    background-image: linear-gradient(green, green);
    background-color: rgba(255, 0, 0, 0.2);
    background-blend-mode: screen;
    margin: 0px;
}
p {
    display: inline;
}
</style>
<p>This test will check that a background-image set on body does not blend with the browser's white background color, it will only blend with the red transparent background-color.<br/>
The test passes if the page has a green background.</p>

chromium/third_party/blink/web_tests/css3/blending/background-blend-mode-body-transparent-color-and-image.html