<!-- webkit-test-runner [ LayoutFormattingContextEnabled=true LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
div {
    background-color: green;
    width: 100px;
    height: 100px;
}
</style>
<div style="position: relative; top: 10px;"></div>
<div style="position: relative; top: 290px;"></div>