<!DOCTYPE html> <!-- webkit-test-runner [ internal:LayoutFormattingContextEnabled=true internal:LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
div {
    height: 20px;
    width: 20px;
    border: 10px solid green;
    margin-bottom: -10px;
}
</style>
<div></div>
<div></div>
<div></div>