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[css-overflow] drop overflow columns and subsequent content with discard #12785

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[css-overflow] drop overflow columns and subsequent content with discard #12785

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87 changes: 85 additions & 2 deletions css-overflow-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1057,8 +1057,6 @@ Fragmentation of Overflow: the 'continue' property</h3>
if it is not already.
[[!CSS-BREAK-3]]
Content after the first [=region break=] is not rendered (see below).
(If the box is a [=multi-column container=],
any [=overflow columns=] are also not rendered.)

Note: This [=region break=] might be <a lt="forced break">forced</a>
(e.g. imposed by 'max-lines' or by another mechanism,
Expand All @@ -1070,6 +1068,91 @@ Fragmentation of Overflow: the 'continue' property</h3>
(such as pagination of this box itself)
do not cause any content to be discarded.

Additionally,
if the box is a [=multi-column container=],
any content in or after [=overflow columns=] is also not rendered,
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Is saying that the content is not rendered, rather than the columns / multicol lines, significant? This wording could imply that column-rules between overflow columns, or in a following multicol line, are rendered.

including any [=out of flow=] content
whose static position is in or after overflow columns.

<div class=example id=discard-overflow-column>
In the absence of the 'continue' property,
based on [[css-multicol-1 inline]],
the following markup and associated CSS would be expected
to render as follows.

<xmp highlight=markup>
<div class="multicol">
<p>Column 1</p>
<p>Column 2</p>
<p>Column 3</p>
<p>Overflow column
<div class="spanner">Spanner 1</div>
</p>
<div class="spanner">Spanner 2</div>
<p>Following 1</p>
<p>Following 2</p>
<p>Following 3</p>
<div class="spanner">Spanner 3</div>
<p>Following 4</p>
<p>Following 5</p>
<p>Following 6</p>
</div>
</xmp>
<pre><code highlight=css>
.multicol {
columns: 3;
border: solid 1px;
}
.multicol p {
break-after: column;
break-inside: avoid;
}
.spanner {
column-span: all;
text-align: center;
}
</code></pre>
<!--
ommitted because incidental to the example, but needed for an exact rendering:
p { margin: 0; }
.multicol {
width: 47ch;
font-family: monospace;
gap: 1ch;
}
-->
<figure>
<pre id=sample-rendering-overflow-multicolumn-1 style="width: 63ch">
<div style="border:solid 1px; width: 47ch;">Column 1 Column 2 Column 3 Overflow column
Spanner 1
Spanner 2
Following 1 Following 2 Following 3
Spanner 3
Following 4 Following 5 Following 6
</div></pre>
</figure>

There is one overflow column,
a spanner whose static position is within that overflow column,
another spanner whose static position is after the overflow column,
inflow content after the spanners and the overflow column,
and another spanner whose static position is in this subsequent inflow content.

If we additionally apply the following style,
everything starting from and including the overflow column is discarded.

<pre><code highlight=css>
.multicol {
continue: discard;
block-ellipsis: auto;
}
</code></pre>
<figure>
<pre id=sample-rendering-overflow-multicolumn-2>
<div style="border:solid 1px; width: 47ch;">Column 1 Column 2 Column 3…</div></pre>
</figure>

</div>
<dt><dfn>collapse</dfn>
<dd>
If the box is a [=block container=], then it must
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