::scroll-marker-group size container can not be its scroller

lilles · chromium-wpt-export-bot · commit b821fbd13b9d · 2025-10-17T01:09:01.000-07:00
Confirmed by spec resolution: w3c/csswg-drafts#11213 (comment) Spec PR: w3c/csswg-drafts#12960 Bug: 452345165 Change-Id: Icd0a5ad9306250b209075ccecc394c6f14ed76be Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7047440 Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org> Commit-Queue: Rune Lillesveen <futhark@chromium.org> Cr-Commit-Position: refs/heads/main@{#1531255}
diff --git a/css/css-overflow/scroll-marker-group-size-container-query.html b/css/css-overflow/scroll-marker-group-size-container-query.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>CSS Overflow Test: Size container for ::scroll-marker-group</title>
+<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-group-property">
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  #container {
+    container-type: inline-size;
+    width: 400px;
+  }
+  #scroller {
+    container-type: inline-size;
+    overflow: auto;
+    width: 200px;
+    height: 200px;
+    scroll-marker-group: before;
+    @container (width = 400px) {
+      &::scroll-marker-group { --test: pass; }
+    }
+  }
+</style>
+<div id="container">
+  <div id="scroller">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  test(() => {
+    assert_equals(getComputedStyle(scroller, "::scroll-marker-group").getPropertyValue("--test"), "pass");
+  }, "::scroll-marker-group skips originating element for size queries");
+</script>
