<!DOCTYPE html> <html> <head> <title>CSS 2.1 Test Suite: Test for z-ordering of inline-block</title> <link rel="author" title="L. David Baron" href="https://dbaron.org/" /> <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" /> <link rel="help" href="http://www.w3.org/TR/CSS21/zindex.html#painting-order" /> <style type="text/css"> div { height: 1em; } div#test span { display:inline-block; vertical-align: top; height: 1em; background: red; color: red; } div#after { margin-top:-1em; } div#after span { display: inline; vertical-align: top; background: green; color: green; border-bottom: 0.25em solid green; border-top: 0.25em solid green; } </style> </head> <body> <div id="test"><span> x </span></div> <div id="after"><span> x </span></div> </body> </html>