<!-- webkit-test-runner [ LayoutFormattingContextEnabled=true LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
div {
 width: 50px;
}
div:nth-child(odd) {
  background-color: green;
}
div:nth-child(even) {
  background-color: blue;
}
</style>
<body style="background-color: white">
<div style="height: 50px"></div>
<div style="height: 100px"></div>
<div style="height: 150px"></div>
<div style="height: 200px"></div>
</body>