<html>
<head>
    <!--
        This test verifies that software layers are promoted to composited layers when their filter
        outsets change to overlap a hardware layer.

        If the test passes, the green drop-shadow of the black layer should appear over the blue
        composited layer.

        Note: Safari will paint the filter in software because drop-shadow is not the last filter in
        the chain.
    -->
    <style>
        #software-layer-to-promote {
            background-color: black