LayoutTests/fast/layoutformattingcontext/inline-box-overlaps-multiple-lines.html

<!-- webkit-test-runner [ LayoutFormattingContextEnabled=true LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
div {
    background: green;
    font-size: 20px;
}
</style>
<div><span>line break<br>this text's parent inline box <span>starts at the previous line</span></span></div>