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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - flex-basis with flex-direction: column and justify-content: center causes elements to overflow parent"
href="https://bugs.webkit.org/show_bug.cgi?id=168130">168130</a>
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<th>Summary</th>
<td>flex-basis with flex-direction: column and justify-content: center causes elements to overflow parent
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>Safari 10
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>CSS
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>miles@milesrausch.com
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<pre>When using justify-content: center and flex-direction: column, WebKit seems to miscalculate the height of the flex parent when some of the flex items have a flex-basis specified. The result is that some items can spill out of the box at the flex-start end.
I had a page where my heading (the first element in my flex container) was spilling up out of the parent and became white text on white background. It took a long time to figure out what exactly was going on. I see it in Safari 10.0.2 and Mobile Safari on iOS 10.2.
Test case: <a href="https://codepen.io/awayken/pen/wgazpb/">https://codepen.io/awayken/pen/wgazpb/</a> - in the problem browsers, Line 1 will be cut off as it overflows upward out of the <body>.
Work-around: either eliminate flex-basis on flex items or use justify-content: flex-start or justify-content: flex-end. There might be other justify-content values that work, too.</pre>
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