| <!DOCTYPE html> |
| <title>CSS Inline Layout Model: Phantom Line Boxes</title> |
| <link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com"> |
| <link rel="help" href="https://drafts.csswg.org/css-inline/#invisible-line-boxes"> |
| <link rel="help" href="https://drafts.csswg.org/css2/#collapsing-margins"> |
| <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9344"> |
| <link rel="match" href="../../reference/ref-filled-green-200px-square.html"> |
| <meta name="assert" content="Non-zero inline-axis margins, padding, or borders |
| prevent a line box from becoming a phantom line box, and therefore prevent |
| the inline formatting context from collapsing margins through. |
| This test checks positive margins."> |
| |
| <style> |
| .wrapper { |
| float: left; |
| width: 50px; |
| background: red; |
| } |
| .wrapper.phantom { |
| background: green; |
| } |
| .wrapper > div { |
| line-height: 0; |
| background: green; |
| } |
| .wrapper.phantom > div { |
| background: red |
| } |
| .wrapper > div::after { |
| content: ""; |
| display: flow-root; |
| margin-top: 200px; |
| } |
| </style> |
| |
| <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> |
| |
| <div class="wrapper phantom"> |
| <div><span style="margin-top: 1px"></span></div> |
| </div> |
| <div class="wrapper phantom"> |
| <div><span style="margin-bottom: 1px"></span></div> |
| </div> |
| <div class="wrapper"> |
| <div><span style="margin-left: 1px"></span></div> |
| </div> |
| <div class="wrapper"> |
| <div><span style="margin-right: 1px"></span></div> |
| </div> |
