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Tue May 3 15:05:30 PDT 2016

> The CSS Box Alignment specification defines a new syntax for
> align-self/align-items, justify-self/justify-items and
> align-content/justify-content CSS properties. This new syntax include new
> values, some of them not valid following the old syntax defined in the CSS
> Flexible box specification for some of these properties. 
> 
> Due to the patch landed for fixing bug #151591 we are now sure that the
> parsing logic for the new syntax is only used when the CSS Grid Layout is
> enabled, since this new layout model defines its alignment procedures based
> on the mentioned CSS properties.

However, in testing, it seems I now have to provide:

    align-content: center;

To override the default value of:

    align-content: flex-start;

when CSSGridLayout is disabled.

That sounds like a backwards compatibility issue. Is that intentional?

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Date: Mon, 17 Oct 2016 17:17:49 -0700
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: Debugger buttons positioned incorrectly, align-items does not appear to be taking affect"
   href="https://bugs.webkit.org/show_bug.cgi?id=163572#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: Debugger buttons positioned incorrectly, align-items does not appear to be taking affect"
   href="https://bugs.webkit.org/show_bug.cgi?id=163572">bug 163572</a>
              from <span class="vcard"><a class="email" href="mailto:joepeck&#64;webkit.org" title="Joseph Pecoraro &lt;joepeck&#64;webkit.org&gt;"> <span class="fn">Joseph Pecoraro</span></a>
</span></b>
        <pre>From that change:

<span class="quote">&gt; The CSS Box Alignment specification defines a new syntax for
&gt; align-self/align-items, justify-self/justify-items and
&gt; align-content/justify-content CSS properties. This new syntax include new
&gt; values, some of them not valid following the old syntax defined in the CSS
&gt; Flexible box specification for some of these properties. 
&gt; 
&gt; Due to the patch landed for fixing <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Should never be reached failure in WebCore::RenderFlexibleBox::alignChildren"
   href="show_bug.cgi?id=151591">bug #151591</a> we are now sure that the
&gt; parsing logic for the new syntax is only used when the CSS Grid Layout is
&gt; enabled, since this new layout model defines its alignment procedures based
&gt; on the mentioned CSS properties.</span >

However, in testing, it seems I now have to provide:

    align-content: center;

To override the default value of:

    align-content: flex-start;

when CSSGridLayout is disabled.

That sounds like a backwards compatibility issue. Is that intentional?</pre>
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