chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/filters-drop-shadow-003.html

<!DOCTYPE html>
<title>CSS Filters: drop-shadow filter on element in outside of the view</title>
<link rel="author" title="Fujii Hironori" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#FilterProperty">
<link rel="help" href="https://webkit.org/b/236800">
<link rel="match" href="reference/filters-drop-shadow-003-ref.html">
<meta name="assert" content="Check that a drop-shadow of an element with drop-shadow filter placed in the outside of the view appears"/>
<style>
div {
    width: 300px;
    height: 300px;
    top: -1000px;
    left: -1000px;
    background-color: red;
    position: relative;
    filter: drop-shadow(1000px 1000px 0 green);
}
</style>
You should see a green box.
<div></div>