<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!-- Testcase for how we compute the baseline of a horizontal flex container with no flex items. This is the main-axis baseline. The spec says this about this case: https://drafts.csswg.org/css-flexbox/#flex-baselines "Otherwise, the flex container has no first/last main-axis baseline set, and one is synthesized if needed according to the rules of its alignment context." The alignment context in this case is inline-level so the margin-box should be used to synthesize the baseline. --> <html> <head> <title>CSS Test: Testing the baseline of an empty horizontal flex container</title> <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"> <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#flex-baselines"> <link rel="match" href="flexbox-baseline-empty-001-ref.html"> <meta charset="utf-8"> <link rel="stylesheet" type="text/css" href="/fonts/ahem.css"> <style> body { font: 20px Ahem; } .flexContainer { display: inline-flex; height: 16px; width: 16px; background: purple; border: 0px dotted black; /* (Elements that want a border will set their border-width.) */ } </style> </head> <body> A <div class="flexContainer"></div> <div class="flexContainer" style="padding-bottom: 20px"></div> <div class="flexContainer" style="padding: 10px"></div> <div class="flexContainer" style="border-width: 3px"></div> <div class="flexContainer" style="border-bottom-width: 4px"></div> <div class="flexContainer" style="border-bottom-width: 4px; margin: 2px"></div> </body> </html>