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chromium/third_party/blink/web_tests/fast/forms/file/input-file-value-with-zoom.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
<script src="resources/file-drag-common.js"></script>
</head>
<body>
<input type="file" name="file" id="file">

<script>
description("This tests the value attribute in file input forms with page zoom in");

if (window.testRunner) {
    testRunner.zoomPageIn();
    testRunner.zoomPageIn();
    testRunner.zoomPageIn();

    var file = document.getElementById("file");
    dragFilesOntoInput(file, ["foo.txt"]);
    
    shouldBeEqualToString("file.value", "C:\\fakepath\\foo.txt");
    shouldBe("file.files.length", "1");
 
    shouldThrow("file.value = 'foo'");
    shouldBeEqualToString("file.value", "C:\\fakepath\\foo.txt");
    shouldBe("file.files.length", "1");

    file.value = "";
    shouldBeEqualToString("file.value", "");
    shouldBe("file.files.length", "0");
}
</script>
</body>
</html>