<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>CSS Multi-column Layout Test: multicolumn and margin-bottom collapsing</title> <link rel="author" title="Opera Software ASA" href="http://www.opera.com/"> <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2013-08-11 --> <link rel="help" href="http://www.w3.org/TR/css3-multicol/#the-multi-column-model" title="2. The multi-column model"> <link rel="match" href="reference/multicol-nested-002-ref.htm"> <meta name="assert" content="This test checks that a block container element's margin-bottom can collapse with its multi-column parent's margin-bottom if no line boxes, no clearance, no padding and no border separate them."> <meta name="flags" content="ahem"> <style type="text/css"> body {margin: 0em;} body > div { font: 1.25em/1 Ahem; width: 32em; column-gap: 1em; column-width: 8em; } /* N == max(1, floor((available-width + column-gap) / (column-width + column-gap))); N == max(1, floor((32em + 1em) / (8em + 1em))); N == max(1, floor(33em / 9em)); N == max(1, floor(3.6)); N == max(1, 3); N == 3; W == ((available-width + column-gap) / N) - column-gap; W == ((32em + 1em) / 3) - 1em; W == (33em / 3) - 1em; W == (11em) - 1em; W == 10em; */ div { background: yellow; color: black; orphans: 1; widows: 1; } div > div {margin: 0 1em 1em;} div + div {color: blue;} div + div + div {color: pink;} </style> </head> <body> <div> <div> bl ac bl ac bl ac bl ac </div> <div> bl ue bl ue bl ue bl ue </div> <div> Pi nk Pi nk Pi nk Pi nk </div> </div> </body> </html>