|  | <!DOCTYPE html> | 
|  | <html> | 
|  | <meta charset="utf-8"> | 
|  | <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com"> | 
|  | <link rel="author" title="Mozilla" href="http://www.mozilla.org/"> | 
|  | <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span"> | 
|  | <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4689"> | 
|  | <link rel="match" href="../reference/ref-filled-green-100px-square.xht"> | 
|  | <meta name="assert" content="This test verifies columns are always balancing before column-spanning element in an unconstrained height and column-fill:auto column container."> | 
|  |  | 
|  | <style> | 
|  | .columns { | 
|  | column-fill: auto; | 
|  | column-count: 2; | 
|  | column-gap: 0; | 
|  | width: 100px; | 
|  | background: red; | 
|  | } | 
|  | .colspan { | 
|  | column-span: all; | 
|  | } | 
|  | .content { | 
|  | height: 200px; | 
|  | background: green; | 
|  | } | 
|  | </style> | 
|  |  | 
|  | <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> | 
|  | <div class="columns"> | 
|  | <div class="content"></div> | 
|  | <div class="colspan"></div> | 
|  | </div> | 
|  | </html> |