<!DOCTYPE html> <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org"> <link rel="help" href="https://www.w3.org/TR/css-multicol-1/#cf"> <link rel="help" href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/br#deprecated_attributes"> <p>Test passes if there is a filled green square below.</p> <div id="mc" style="columns:4; width:100px; background:green;"> <div style="float:left; width:10px; height:400px;"></div> <br clear="all"> </div> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script> test(()=> { assert_equals(mc.offsetHeight, 100); }); </script>