<!-- webkit-test-runner [ LayoutFormattingContextEnabled=true LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
div {
    width: 100px;
    height: 100px;
}
</style>
<div style="background-color: green;"></div>
<div style="background-color: blue; height: 10px; margin-top: -100px"></div>