Add scroll-markers feature (#2654)

* Add scroll-markers feature.

* Generate scroll-markers.yml.dist.

* Update features/scroll-markers.yml

Co-authored-by: Patrick Brosset <[email protected]>

* Update csroll-markers.yml.dist

* Update features/scroll-markers.yml

---------

Co-authored-by: Robert Flack <[email protected]>
Co-authored-by: Patrick Brosset <[email protected]>

Author: 3 people

features/scroll-markers.yml

@@ -0,0 +1,11 @@
+name: Scroll markers
+description: A scroll container can be navigated by activating `::scroll-marker` pseudo-elements which appear in a generated `::scroll-marker-group` pseudo-element, either before or after the scroll container.
+spec: https://drafts.csswg.org/css-overflow-5/#scroll-markers
+group: scrolling
+compat_features:
+  - css.selectors.scroll-marker
+  - css.selectors.scroll-marker-group
+  - css.properties.scroll-marker-group
+  - css.properties.scroll-marker-group.after
+  - css.properties.scroll-marker-group.before
+  - css.properties.scroll-marker-group.none

features/scroll-markers.yml.dist

@@ -0,0 +1,13 @@
+# Generated from: scroll-markers.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}
+compat_features:
+  - css.properties.scroll-marker-group
+  - css.properties.scroll-marker-group.after
+  - css.properties.scroll-marker-group.before
+  - css.properties.scroll-marker-group.none
+  - css.selectors.scroll-marker
+  - css.selectors.scroll-marker-group