This page contains various use cases to support the analysis and discussion about what we should do with page, column and regions breaks.

Separate each section designated by a heading element on a distinct region.

<div id="r1" style="content:from-flow(article)"></div>
<div id="r2" style="content:from-flow(article)"></div>
<div id="r3" style="content:from-flow(article)"></div>
 
<div style="flow:article">
	<h2 style="break-before: region"></h2> 
	<p>...</p>
	<h2 style="break-before: region"></h2> 
	<p>...</p>
	<h2 style="break-before: region"></h2> 
	<p>...</p>
</div>

<div style="columns:3">
	<p id="p_0">...</p>
	<p id="p_1" style="break-before:page">...</p>
	<p id="p_2" style="break-after:column">...</p>
	<p id="p_3">...</p>
</div>

In this use case, the break-before on p_1 indicates that the page flow should be broken. The <div> is part of the page flow and is broken, causing a new row to be created for the multi-column element (3 new columns). So p_2 will find itself on the second page. Because there is a break-after:column on p_2, p_3 will be laid out at the beginning of the second column, on the second page.

<div id="r0" style="content:from-flow(article)">
</div>
 
<div id="r1" style="content:from-flow(article)">
</div>
 
<div id="r2" style="content:from-flow(article)">
</div>
 
<div style="flow:article">
	<p id="p_0">...</p>
	<p id="p_1" style="break-before:page">...</p>
	<p id="p_2" style="break-after:region">...</p>
	<p id="p_3">...</p>
</div>

<div id="d1" style="columns:3">
	<div id="d_11">...</div>
	<div id="d_12" style="columns:3">
	    <p id="p_0">...</p>
    	    <p id="p_1">...</p>
	    <p id="p_2" style="break-after:column">...</p>
	    <p id="p_3">...</p>
	</div>
	<div id="d_13" style="break-before: column">...</div>
</div>

Avoid breaking ordered lists. The index needs to be incrementally correct.

<div id="r1" style="content:from-flow(article)"></div>
<div id="r2" style="content:from-flow(article)"></div>
 
<div style="flow:article"> 
	<p>...</p>
	<ol style="break-before: region">...</ol>
	<p>...</p>
</div>

<div id="r1" style="content:from-flow(article)"></div>
<div id="r2" style="content:from-flow(article)"></div>
 
<div style="flow:article"> 
	<p>...</p>
	<table style="break-before: region">...</table>
	<p>...</p>
</div>

Allow breaking of nested lists, ordered or unordered, across regions. Keep the correct nesting index and indentation across regions.

<div id="r1" style="content:from-flow(article)"></div>
<div id="r2" style="content:from-flow(article)"></div>
 
<div style="flow:article">
	<p>...</p> 
	<ol>
		<li>...</li>
		<li>
			<ol>
				<li>...</li>
				<li style="break-after:region">
					<ol>...</ol>
				</li>
				<li>...</li>
			</ol>
		</li> 
		<li>...</li>
	</ol>
	<p>...</p>
</div>  

CODE

photo