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chromium/third_party/blink/web_tests/scrollbars/custom-scroll-corner-crash.html 

<!DOCTYPE html>
<style>
body {
    overflow-y: scroll;
}
::-webkit-scrollbar-corner {
    background: green;
}
div {
    width: 110%;
    height: 110%;
}
</style>
<div>
This test passes if it does not crash.
</div>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>