<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Containment Test: Reference file</title> <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com"> <style> div { display: inline-flex; border: 5px solid green; /* Layout containment creates a stacking context, the following lines simuluate the same in the reference file. */ position: relative; z-index: 1; } </style> <p>This test passes if it has the same output as the reference. You see the word "before", a 10px green square at the bottom, and then the word "after".</p> before<div></div>after