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[css-overflow] Move scrollbar-gutter from level 4 to level 3
As per https://logs.csswg.org/irc.w3.org/css/2021-08-04/#e1425617
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‎css-overflow-3/Overview.bs‎

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@@ -729,6 +729,173 @@ 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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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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is called the <dfn>scrollbar gutter</dfn>.
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The 'scrollbar-gutter' property gives control to the author
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over the presence of <a>scrollbar gutters</a>
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separately from the ability to control the presence of scrollbars
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provided by the 'overflow' property.
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<pre class="propdef">
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Name: scrollbar-gutter
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Value: auto | stable && both-edges?
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Initial: auto
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Applies to: [=scroll containers=]
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Inherited: no
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Computed value: specified keyword(s)
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Animation type: discrete
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</pre>
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This property affects the presence of <a>scrollbar gutters</a>
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placed at the <a>inline start</a> edge or <a>inline end</a> edge of the box.
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The presence of a <a>scrollbar gutter</a>
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at the <a>block start</a> edge and <a>block end</a> edge of the box
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cannot be controlled in this level,
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and is determined the same way as the presence of <a>scrollbar gutters</a>
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placed at the <a>inline start</a> edge or <a>inline end</a> edge of the box
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when 'scrollbar-gutter' is ''scrollbar-gutter/auto''.
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Scrollbars which by default are placed over the content box
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and do not cause <a>scrollbar gutters</a> to be created
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are called <dfn>overlay scrollbars</dfn>.
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Such scrollbars are usually partially transparent, revealing the content behind them if any.
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Their appearance and size may vary
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based on whether and how the user is interacting with them.
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Scrollbars which are always placed in a <a>scrollbar gutter</a>,
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consuming space when present,
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are called <dfn>classic scrollbars</dfn>.
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Such scrollbars are usually opaque.
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Whether <a>classic scrollbars</a> or <a>overlay scrollbars</a> are used,
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the appearance and size of the scrollbar,
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and whether scrollbars appear on the start or end edge of the box,
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is UA defined.
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Note: Which side a scrollbar appears on may depend on
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operating system conventions,
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[=bidirectionality=],
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or other ergonomic considerations.
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In the case of <a>classic scrollbars</a>,
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the width of the <a>scrollbar gutter</a>,
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if present (see below),
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is the same as the width of the scrollbar.
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In the case of <a>overlay scrollbars</a>,
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no <a>scrollbar gutter</a> is present.
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Note: There are known use cases that could be addressed
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by enabling <a>scrollbar gutters</a>
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for <a>overlay scrollbars</a>,
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but no satisfactory design has been agreed to so far.
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This could be addressed by future extensions of this property.
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See [[css-overflow-4#sbg-ext]].
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The values of this property have the following meaning:
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<dl dfn-for="scrollbar-gutter" dfn-type=value>
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<dt><dfn>auto</dfn>
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<dd><a>Classic scrollbars</a> consume space by creating a <a>scrollbar gutter</a>
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when 'overflow' is ''overflow/scroll'',
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or when 'overflow' is ''overflow/auto'' and the box is overflowing.
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<a>Overlay scrollbars</a> do not consume space.
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<dt><dfn>stable</dfn>
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<dd>The <a>scrollbar gutter</a> is present
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for <a>classic scrollbars</a>
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when 'overflow' is ''overflow/hidden'', ''overflow/scroll'', or ''overflow/auto'',
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regardless of whether the box is actually overflowing.
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<a>Overlay scrollbars</a> do not consume space.
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Note: This does not change whether the scrollbar itself is visible,
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only the presence of a gutter is affected.
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<dt><dfn>both-edges</dfn>
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<dd>If a <a>scrollbar gutter</a> would be present
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on one of the inline start edge or the inline end edge of the box,
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another <a>scrollbar gutter</a> must be present on the opposite edge as well.
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</dl>
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When the <a>scrollbar gutter</a> is present but the scrollbar is not,
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or the scrollbar is transparent or otherwise does not fully obscure the <a>scrollbar gutter</a>,
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the background of the <a>scrollbar gutter</a> must be painted as an extension of the padding.
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As for the 'overflow' property,
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when 'scrollbar-gutter' is set on the root element,
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the user agent must apply it to the viewport instead,
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and the used value on the root element itself is ''scrollbar-gutter: auto''.
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However, unlike the 'overflow' property,
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the user agent must not propagate 'scrollbar-gutter' from the HTML <{body}> element.
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<div class=note>
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Note: The following table summarizes the interaction of 'overflow' and 'scrollbar-gutter'
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showing in which case space is reserved for a <a>classic scrollbar</a>'s <a>scrollbar gutter</a>.
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<style>
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.data.complex tbody th:last-of-type {
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border-right: solid black 2px;
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}
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.data.complex tbody tr:nth-of-type(2n) td,
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.data.complex tbody tr:nth-of-type(2n) th:not([rowspan]) {
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background: rgba(127, 127, 127, 0.25);
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}
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</style>
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<table class="data complex">
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<caption>
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Should a <a>classic scrollbar</a>'s <a>scrollbar gutter</a> be present?</caption>
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<thead>
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<tr>
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<th>'overflow'
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<th>'scrollbar-gutter'
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<th>Overflowing
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<th>Not overflowing
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</thead>
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<tr>
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<th rowspan=2>''overflow/scroll''
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<th>''scrollbar-gutter/auto''
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<td>yes
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<td>yes
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/auto''
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<th>''scrollbar-gutter/auto''
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<td>yes
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/hidden''
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<th>''scrollbar-gutter/auto''
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<td>
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/visible'', ''overflow/clip''
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<th>''scrollbar-gutter/auto''
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<td>
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>
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<td>
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</table>
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</div>
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<h2 id="auto-ellipsis">
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Automatic Ellipses</h2>
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@@ -1492,6 +1659,7 @@ Fragmentation of Overflow: the 'continue' property</h3>
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Changes from the <a href="https://www.w3.org/TR/2020/WD-css-overflow-3-20200603/">2020-06-03 Working Draft</a></h3>
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* Moved the 'scroll-behavior' property from [[CSSOM-VIEW]] to this specification.
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* Adopt the 'scrollbar-gutter' property, previously defined in [[CSS-OVERFLOW-4]].
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<!-- This list is not complete -->
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<h3 id="changes-since-2018-07-31">

‎css-overflow-4/Overview.bs‎

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@@ -219,173 +219,6 @@ Value Definitions</h3>
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Issue: copy level 3 content when final
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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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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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is called the <dfn>scrollbar gutter</dfn>.
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The 'scrollbar-gutter' property gives control to the author
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over the presence of <a>scrollbar gutters</a>
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separately from the ability to control the presence of scrollbars
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provided by the 'overflow' property.
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<pre class="propdef">
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Name: scrollbar-gutter
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Value: auto | stable && both-edges?
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Initial: auto
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Applies to: [=scroll containers=]
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Inherited: no
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Computed value: specified keyword(s)
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Animation type: discrete
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</pre>
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This property affects the presence of <a>scrollbar gutters</a>
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placed at the <a>inline start</a> edge or <a>inline end</a> edge of the box.
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The presence of a <a>scrollbar gutter</a>
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at the <a>block start</a> edge and <a>block end</a> edge of the box
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cannot be controlled in this level,
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and is determined the same way as the presence of <a>scrollbar gutters</a>
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placed at the <a>inline start</a> edge or <a>inline end</a> edge of the box
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when 'scrollbar-gutter' is ''scrollbar-gutter/auto''.
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Scrollbars which by default are placed over the content box
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and do not cause <a>scrollbar gutters</a> to be created
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are called <dfn>overlay scrollbars</dfn>.
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Such scrollbars are usually partially transparent, revealing the content behind them if any.
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Their appearance and size may vary
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based on whether and how the user is interacting with them.
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Scrollbars which are always placed in a <a>scrollbar gutter</a>,
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consuming space when present,
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are called <dfn>classic scrollbars</dfn>.
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Such scrollbars are usually opaque.
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Whether <a>classic scrollbars</a> or <a>overlay scrollbars</a> are used,
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the appearance and size of the scrollbar,
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and whether scrollbars appear on the start or end edge of the box,
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is UA defined.
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Note: Which side a scrollbar appears on may depend on
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operating system conventions,
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[=bidirectionality=],
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or other ergonomic considerations.
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In the case of <a>classic scrollbars</a>,
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the width of the <a>scrollbar gutter</a>,
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if present (see below),
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is the same as the width of the scrollbar.
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In the case of <a>overlay scrollbars</a>,
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no <a>scrollbar gutter</a> is present.
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Note: There are known use cases that could be addressed
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by enabling <a>scrollbar gutters</a>
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for <a>overlay scrollbars</a>,
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but no satisfactory design has been agreed to so far.
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This could be addressed by future extensions of this property.
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See [[#sbg-ext]].
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The values of this property have the following meaning:
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<dl dfn-for="scrollbar-gutter" dfn-type=value>
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<dt><dfn>auto</dfn>
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<dd><a>Classic scrollbars</a> consume space by creating a <a>scrollbar gutter</a>
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when 'overflow' is ''overflow/scroll'',
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or when 'overflow' is ''overflow/auto'' and the box is overflowing.
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<a>Overlay scrollbars</a> do not consume space.
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<dt><dfn>stable</dfn>
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<dd>The <a>scrollbar gutter</a> is present
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for <a>classic scrollbars</a>
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when 'overflow' is ''overflow/hidden'', ''overflow/scroll'', or ''overflow/auto'',
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regardless of whether the box is actually overflowing.
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<a>Overlay scrollbars</a> do not consume space.
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Note: This does not change whether the scrollbar itself is visible,
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only the presence of a gutter is affected.
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<dt><dfn>both-edges</dfn>
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<dd>If a <a>scrollbar gutter</a> would be present
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on one of the inline start edge or the inline end edge of the box,
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another <a>scrollbar gutter</a> must be present on the opposite edge as well.
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</dl>
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When the <a>scrollbar gutter</a> is present but the scrollbar is not,
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or the scrollbar is transparent or otherwise does not fully obscure the <a>scrollbar gutter</a>,
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the background of the <a>scrollbar gutter</a> must be painted as an extension of the padding.
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As for the 'overflow' property,
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when 'scrollbar-gutter' is set on the root element,
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the user agent must apply it to the viewport instead,
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and the used value on the root element itself is ''scrollbar-gutter: auto''.
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However, unlike the 'overflow' property,
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the user agent must not propagate 'scrollbar-gutter' from the HTML <{body}> element.
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<div class=note>
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Note: The following table summarizes the interaction of 'overflow' and 'scrollbar-gutter'
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showing in which case space is reserved for a <a>classic scrollbar</a>'s <a>scrollbar gutter</a>.
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<style>
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.data.complex tbody th:last-of-type {
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border-right: solid black 2px;
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}
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.data.complex tbody tr:nth-of-type(2n) td,
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.data.complex tbody tr:nth-of-type(2n) th:not([rowspan]) {
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background: rgba(127, 127, 127, 0.25);
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}
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</style>
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<table class="data complex">
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<caption>
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Should a <a>classic scrollbar</a>'s <a>scrollbar gutter</a> be present?</caption>
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<thead>
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<tr>
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<th>'overflow'
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<th>'scrollbar-gutter'
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<th>Overflowing
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<th>Not overflowing
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</thead>
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<tr>
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<th rowspan=2>''overflow/scroll''
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<th>''scrollbar-gutter/auto''
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<td>yes
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<td>yes
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/auto''
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<th>''scrollbar-gutter/auto''
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<td>yes
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/hidden''
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<th>''scrollbar-gutter/auto''
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<td>
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>yes
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<td>yes
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<tr>
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<th rowspan=2>''overflow/visible'', ''overflow/clip''
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<th>''scrollbar-gutter/auto''
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<td>
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<td>
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<tr>
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<th>''scrollbar-gutter/stable''
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<td>
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<td>
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</table>
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</div>
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<h2 id="text-overflow" caniuse="text-overflow">Overflow Ellipsis: the 'text-overflow' property</h2>
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<pre class="propdef">
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<ul>
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<li>The Fragmentation of overflow, Paginated overflow, and Fragment overflow sections and subsections have been removed form Level 3 and moved to Level 4.
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<li>The 'scrollbar-gutter' property has been added.
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</ul>
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<h2 class=no-num id="acknowledgments">

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