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[css-overflow] Removing the fragmenting values from 'overflow'
We have resolved to move the fragmenting values from the overflow property into a new one. This cleans up the overflow section in preparation of this. Note that the sections about fragments and pagination have not yet been update to reflect this.
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‎css-overflow/Overview.bs‎

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@@ -380,7 +380,7 @@ Introduction</h2>
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<pre class=propdef>
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Name: overflow-x, overflow-y
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Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto'' | ''paged-x'' | ''paged-y'' | ''paged-x-controls'' | ''paged-y-controls'' | ''fragments''
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Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto''
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Initial: ''visible''
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Applies to: block containers [[!CSS21]], flex containers [[!CSS3-FLEXBOX]], and grid containers [[!CSS3-GRID-LAYOUT]]
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Inherited: no
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<pre class=propdef>
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Name: overflow
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Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto'' | ''paged-x'' | ''paged-y'' | ''paged-x-controls'' | ''paged-y-controls'' | ''fragments''
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Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto''
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Initial: see individual properties
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Applies to: block containers [[!CSS21]], flex containers [[!CSS3-FLEXBOX]], and grid containers [[!CSS3-GRID-LAYOUT]]
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Inherited: no
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Canonical order: <abbr title="follows order of property value definition">per grammar</abbr>
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</pre>
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<p>The values of these properties are:</p>
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<dl dfn-for="overflow" dfn-type="value">
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<dt><dfn>visible</dfn>
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<dd>
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There is no special handling of overflow, that is, it
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may be rendered outside the block container.
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</dd>
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<dt><dfn>hidden</dfn>
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<dt><dfn>scroll</dfn>
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<dt><dfn>auto</dfn>
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<dd>
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These values are collectively the <dfn dfn>scrolling values</dfn>;
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they are defined in the section on
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<a href="#scrolling-overflow">scrolling and hidden overflow</a>.
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</dd>
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<dt><dfn>paged-x</dfn>
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<dt><dfn>paged-y</dfn>
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<dt><dfn>paged-x-controls</dfn>
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<dt><dfn>paged-y-controls</dfn>
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<dt><dfn>fragments</dfn>
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<dd>
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These values are collectively the <dfn dfn>fragmenting values</dfn>;
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they are defined in the sections on
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<a href="#paginated-overflow">paginated overflow</a> and
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<a href="#fragment-overflow">fragment overflow</a>.
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</dd>
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</dl>
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<div id="overflow-computed-values">
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<p>The computed values of 'overflow-x' and 'overflow-y'
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are determined from the cascaded values [[!CSS3CASCADE]]
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based on the following rules:</p>
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<ol>
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<li>
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If one or both of the cascaded values are
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<a>fragmenting values</a>, then:
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<ol>
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<li>
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If one of the cascaded values is one of the
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<a>fragmenting values</a>
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and the other is not,
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then the computed values are
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the same as the cascaded values.
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</li>
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<li>
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If both of the cascaded values are <a>fragmenting values</a>, then:
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<ol>
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<li>
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for horizontal writing mode [[!CSS3-WRITING-MODES]],
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the computed value for 'overflow-y' is the cascaded value
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and the computed value for 'overflow-x' is ''overflow/hidden'', or
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</li>
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<li>
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for vertical writing mode [[!CSS3-WRITING-MODES]],
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the computed value for 'overflow-x' is the cascaded value
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and the computed value for 'overflow-y' is ''overflow/hidden''.
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</li>
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</ol>
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</li>
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</ol>
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</li>
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<li>
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Otherwise, if one cascaded values is
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one of the <a>scrolling values</a>
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and the other is ''overflow/visible'',
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If one cascaded values is ''overflow/visible''
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and the other is not,
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then computed values are the cascaded values
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with ''overflow/visible'' changed to ''overflow/auto''.
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</li>
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</ol>
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</div>
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<p>The values of these properties are:</p>
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<dl dfn-for="overflow" dfn-type="value">
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<dt><dfn>visible</dfn>
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<dd>
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There is no special handling of overflow, that is, it
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may be rendered outside the block container.
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</dd>
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<dt><dfn>hidden</dfn>
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<dt><dfn>scroll</dfn>
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<dt><dfn>auto</dfn>
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<dd>
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<p class="issue">
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Move material from [[CSS21]] and [[CSS3BOX]] here.
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</p>
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</dd>
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</dl>
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<p class="issue">
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Are all 4 of the ''paged-*'' values really needed?
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Explain which directions allow scrolling and which don't,
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as a function of 'direction'
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(including propagation of 'direction' to the ICB).
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</p>
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<p>
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When the <a>fragmenting values</a> are used,
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the overflow from the fragments themselves
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treats the fragmenting value as ''overflow/hidden''.
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<span class="issue">Is this the right behavior?</span>
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<span class="issue">Give example.</span>
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</p>
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<p class="issue">
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[[CSS3-MARQUEE]] describes an 'overflow-style' property,
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'overflow-x' and 'overflow-y' instead?
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</p>
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<h2 id="fragmentation-properties">Fragmentation properties</h2>
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Issue: This section is a WIP, and currently just holds bits of information that need to be massaged into proper form.
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| ''paged-x'' | ''paged-y'' | ''paged-x-controls'' | ''paged-y-controls'' | ''fragments''
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<p class="issue">
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Are all 4 of the ''paged-*'' values really needed?
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</p>
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<dl>
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<dt><dfn>paged-x</dfn>
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<dt><dfn>paged-y</dfn>
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<dt><dfn>paged-x-controls</dfn>
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<dt><dfn>paged-y-controls</dfn>
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<dt><dfn>fragments</dfn>
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<dd>
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These values are collectively the <dfn dfn>fragmenting values</dfn>;
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they are defined in the sections on
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<a href="#paginated-overflow">paginated overflow</a> and
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<a href="#fragment-overflow">fragment overflow</a>.
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</dd>
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</dl>
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<div class="issue">
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Having split the overflow and fragmentation properties, this issue is no longer relevant, but there are
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useful bits of information in the thread, so I am leaving it here for now.
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There are <a href="http://lists.w3.org/Archives/Public/www-style/2012May/1197.html">discussions</a>
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about how overflow, overflow-style, overflow-x and overflow-y
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should work and interact with each other.
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Until consensus on this topic is reached,
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it is not completely clear which of these
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should be used for
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paged-x | paged-y | paged-x-controls | paged-y-controls | fragments
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</p>
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<h2 id="scrolling-overflow">Scrolling and hidden overflow</h2>
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<p class="issue">
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Move material from [[CSS21]] and [[CSS3BOX]] here.
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</p>
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</div>
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<p class="issue">
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Explain which directions allow scrolling and which don't,
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as a function of 'direction'
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(including propagation of 'direction' to the ICB).
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</p>
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<h2 id="paginated-overflow">Paginated overflow</h2>
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