[css-break-4] Add always/all values to break-before/break-after.

Author: fantasai

css-break-4/Overview.bs

@@ -13,6 +13,7 @@ Abstract: This module describes the fragmentation model that partitions a flow i
 Abstract: It builds on the Page model module and introduces and defines the fragmentation model.
 Abstract: It adds functionality for pagination, breaking variable fragment size and orientation, widows and orphans.
 Ignored Terms: background positioning area, region chain, … message topic …, reference box
+At Risk: the ''break-before/all'' value of 'break-before'/'break-after'
 </pre>
 
 <h1>CSS Fragmentation Module Level 4 <br> <small>Breaking the Web, one fragment at a time</small></h1>
@@ -46,10 +47,11 @@ Introduction</h2>
 	and how such breaks can be
 	<a href="https://www.w3.org/TR/css-break-3/#breaking-controls">controlled by the author</a>.
 
-	ISSUE: This is currently a diff spec.
-	See <a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Level 3</a>
-	for the rest of the specification.
-	(That text will eventually be folded into this document.)
+	This specification is identical to
+	<a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Level 3</a>
+	except for the addition of the 'margin-break' property
+	and the ''break-before/always'' and ''break-before/all'' values
+	of the 'break-before' and 'break-after' properties.
 
 <h3 id="placement">
 Module Interactions</h3>
@@ -244,7 +246,7 @@ Breaks Between Boxes: the 'break-before' and 'break-after' properties</h3>
 
 	<pre class="propdef">
 	Name: break-before, break-after
-	Value: auto | avoid | avoid-page | page | left | right | recto | verso | avoid-column | column | avoid-region | region
+	Value: auto | avoid | always | all | avoid-page | page | left | right | recto | verso | avoid-column | column | avoid-region | region
 	Initial: auto
 	Applies to: block-level boxes, grid items, flex items, table row groups, table rows (but see prose)
 	Inherited: no
@@ -255,7 +257,7 @@ Breaks Between Boxes: the 'break-before' and 'break-after' properties</h3>
 	These properties specify page/column/region break behavior
 	before/after the generated box.
 	The <dfn>forced break values</dfn>
-	''left'', ''right'', ''recto'', ''verso'', ''page'', ''column'' and ''region''
+	''always'', ''all'', ''left'', ''right'', ''recto'', ''verso'', ''page'', ''column'' and ''region''
 	create a <a href="#forced-breaks">forced break</a> in the flow
 	while the <dfn>avoid break values</dfn>
 	''break-before/avoid'', ''break-before/avoid-page'', ''break-before/avoid-column'' and ''break-before/avoid-region''
@@ -283,6 +285,25 @@ Generic Break Values</h4>
 	<dt><dfn>avoid</dfn>
 	<dd>
 		Avoid a break before/after the <a href="https://www.w3.org/TR/CSS2/visuren.html#block-boxes">principal box</a>.
+
+	<dt><dfn>always</dfn>
+	<dd>
+		Always force a break before/after the <a>principal box</a>.
+		The type of this break is that of the immediately-containing <a>fragmentation context</a>.
+		For example, in a <a>multi-column container</a> forces a <a>column break</a>;
+		in <a>paged media</a> not inside a <a>multi-column container</a>,
+		forces a <a>page break</a>.
+
+	<dt><dfn>all</dfn>
+	<dd>
+		Always force a break before/after the <a>principal box</a>.
+		This value breaks through all containing <a>fragmentation contexts</a>.
+		For example, inside a <a>multi-column container</a> in a <a>region</a> in a <a>multi-column container</a> in <a>paged media</a>,
+		it forces simultaneously a <a>column break</a> in the inner <a>multi-column container</a>,
+		a <a>region break</a>, a <a>column break</a> in the outer <a>multi-column container</a>,
+		and a <a>page break</a>.
+
+		Issue: It's unclear if this value is needed.
 	</dl>
 
 <h4 id="page-break-values" class="no-num">
@@ -1223,6 +1244,7 @@ Changes Since Level 3</h3>
 	<a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Level 3</a>:
 	<ul>
 		<li>The 'margin-break' property.
+		<li>The ''break-before/always'' and ''break-before/all'' values of 'break-before'/'break-after'.
 	</ul>
 
 <h2 class="no-num" id="acknowledgments">