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[css-overflow-3][editorial] Consolidate scrollbar layout sections (move section)
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‎css-overflow-3/Overview.bs

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@@ -503,81 +503,6 @@ Overflow in Print and Other Static Media</h3>
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for example, e-book readers paginate content,
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but are interactive.
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<h3 id="scrollbar-layout">
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Scrollbars and Layout</h3>
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When reserving space for a scrollar placed at the edge of an element's box,
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the reserved space is inserted between the inner border edge
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and the outer padding edge.
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For the purpose of the <a spec=css-backgrounds>background positioning area</a> and <a spec=css-backgrounds>background painting area</a> however,
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this reserved space is considered to be part of the [=padding box=].
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<div class="example">
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In the following document fragment,
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both an absolutely-positioned element
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and a background image
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are positioned to the top right of the box.
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<xmp highlight=html>
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<style>
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article {
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background: top right no-repeat url(circle.png);
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position: relative;
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overflow: auto; }
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aside { position: absolute; top: 0; right: 0; }
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</style>
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<article>
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<aside>×</aside>
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</article>
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</xmp>
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If no scrollbars are present on <code>&lt;article></code>,
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they will both coincide in the top right padding edge corner.
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However, if scrollbars are present
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then <code>&lt;aside></code> will be completely visible,
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on the right padding-box edge adjacent to the scrollbars;
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whereas the background image will be tucked underneath the scrollbars,
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in the top right corner of the scrollbar-extended <a spec=css-backgrounds>background positioning area</a>.
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</div>
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When the box is intrinsically sized,
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this reserved space is added to the size of its contents.
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It is otherwise subtracted from space alotted to the [=content area=].
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To the extent that the presence of scrollbars can affect sizing,
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UAs must start with the assumption that no scrollbars are needed,
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and recalculate sizes if it turns out they are.
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<div class="example">
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In the following document fragment,
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the outer <code>&lt;article></code> has ''height: auto'', but ''max-height: 5em''.
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The inner <code>&lt;section></code> has large margins and would normally just fit:
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<xmp highlight=html>
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...
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article { overflow: auto; max-height: 5em; width: max-content; }
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section { margin: 2em; line-height: 1 }
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...
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<article>
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<section>
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This section has big margins.
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</section>
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</article>
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</xmp>
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If we assumed that <code>&lt;article></code> needed scrollbars,
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then the height of <code>&lt;section></code>,
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including the single line of text and twice 2em of margins,
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adds up to 5em plus a scrollbar.
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Since that is greater than 5em, the maximum allowed height,
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it seems we made the right assumption and d1 indeed needs scrollbars.
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However, we should have started by assuming that no scrollbars are needed.
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In that case the content height of <code>&lt;article></code>
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is exactly the maximum height of 5em,
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proving that the assumption was correct
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and <code>&lt;article></code> indeed should not have scrollbars.
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</div>
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<h3 id="scrolling-direction">
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Scrolling Origin, Direction, and Restriction</h3>
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@@ -744,8 +669,86 @@ Smooth Scrolling: the 'scroll-behavior' Property</h3>
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User agents may ignore this property. <!--fingerprint-->
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<h2 id="scrollbar-gutter-property">
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Reserving space for the scrollbar: the 'scrollbar-gutter' property</h2>
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<h2 id="scrollbar-layout">
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Scrollbars and Layout</h2>
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<h3 id="scrollbar-sizing">
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Reserving Space for the Scrollbar</h3>
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When reserving space for a scrollar placed at the edge of an element's box,
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the reserved space is inserted between the inner border edge
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and the outer padding edge.
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For the purpose of the <a spec=css-backgrounds>background positioning area</a> and <a spec=css-backgrounds>background painting area</a> however,
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this reserved space is considered to be part of the [=padding box=].
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<div class="example">
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In the following document fragment,
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both an absolutely-positioned element
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and a background image
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are positioned to the top right of the box.
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<xmp highlight=html>
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<style>
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article {
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background: top right no-repeat url(circle.png);
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position: relative;
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overflow: auto; }
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aside { position: absolute; top: 0; right: 0; }
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</style>
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<article>
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<aside>×</aside>
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</article>
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</xmp>
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If no scrollbars are present on <code>&lt;article></code>,
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they will both coincide in the top right padding edge corner.
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However, if scrollbars are present
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then <code>&lt;aside></code> will be completely visible,
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on the right padding-box edge adjacent to the scrollbars;
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whereas the background image will be tucked underneath the scrollbars,
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in the top right corner of the scrollbar-extended <a spec=css-backgrounds>background positioning area</a>.
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</div>
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When the box is intrinsically sized,
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this reserved space is added to the size of its contents.
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It is otherwise subtracted from space alotted to the [=content area=].
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To the extent that the presence of scrollbars can affect sizing,
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UAs must start with the assumption that no scrollbars are needed,
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and recalculate sizes if it turns out they are.
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<div class="example">
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In the following document fragment,
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the outer <code>&lt;article></code> has ''height: auto'', but ''max-height: 5em''.
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The inner <code>&lt;section></code> has large margins and would normally just fit:
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<xmp highlight=html>
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...
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article { overflow: auto; max-height: 5em; width: max-content; }
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section { margin: 2em; line-height: 1 }
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...
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<article>
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<section>
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This section has big margins.
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</section>
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</article>
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</xmp>
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If we assumed that <code>&lt;article></code> needed scrollbars,
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then the height of <code>&lt;section></code>,
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including the single line of text and twice 2em of margins,
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adds up to 5em plus a scrollbar.
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Since that is greater than 5em, the maximum allowed height,
741+
it seems we made the right assumption and d1 indeed needs scrollbars.
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However, we should have started by assuming that no scrollbars are needed.
744+
In that case the content height of <code>&lt;article></code>
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is exactly the maximum height of 5em,
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proving that the assumption was correct
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and <code>&lt;article></code> indeed should not have scrollbars.
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</div>
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<h3 id="scrollbar-gutter-property">
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Reserving space for the scrollbar: the 'scrollbar-gutter' property</h3>
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The space between the inner border edge and the outer padding edge
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which user agents may reserve to display the scrollbar

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