diff --git a/third_party/blink/renderer/core/css/element_rule_collector.cc b/third_party/blink/renderer/core/css/element_rule_collector.cc
index 99e69f0a6f82f..dccdc4d2a1840 100644
--- a/third_party/blink/renderer/core/css/element_rule_collector.cc
+++ b/third_party/blink/renderer/core/css/element_rule_collector.cc
@@ -685,6 +685,34 @@ void ElementRuleCollector::DidMatchRule(
 
       if (!universal)
         result_.SetMatchesNonUniversalHighlights();
+
+      const CSSSelector& s = rule_data->Selector();
+      DLOG(INFO) << context_.GetElement()
+          << " " << s.SelectorText()
+          << "->" << (
+              s.TagHistory()
+                  ? s.TagHistory()->SelectorText()
+                  : "nullptr"
+          )
+          << " local=" << (
+              s.Match() == CSSSelector::kTag
+                  ? s.TagQName().LocalName()
+                  : "!kTag"
+          )
+          << " prefix=" << (
+              s.Match() == CSSSelector::kTag
+                  ? s.TagQName().Prefix()
+                  : "!kTag"
+          )
+          << (
+              s.Match() != CSSSelector::kTag
+                  ? ""
+                  : s.TagQName().Prefix() == g_star_atom
+                      ? "==*"
+                      : "!=*"
+          )
+          << " did=" << !universal
+          << " flag=" << result_.MatchesNonUniversalHighlights();
     }
   }
 }
diff --git a/third_party/blink/renderer/core/css/resolver/style_resolver.cc b/third_party/blink/renderer/core/css/resolver/style_resolver.cc
index 8af5450cdc94b..92d19900f8f50 100644
--- a/third_party/blink/renderer/core/css/resolver/style_resolver.cc
+++ b/third_party/blink/renderer/core/css/resolver/style_resolver.cc
@@ -1256,6 +1256,14 @@ void StyleResolver::ApplyBaseStyleNoCache(
         // only universal highlight rules.
         skip_apply_highlight = true;
       }
+
+      DLOG(INFO) << "ABSNC type=" << style_request.type
+        << " pseudo=" << (unsigned)style_request.pseudo_id
+        << " element=" << element
+        << " parent_flag=" << parent_non_universal
+        << " self_flag=" << self_non_universal
+        << " root=" << (element->parentNode() == element->ContainingTreeScope().RootNode())
+        << " skip=" << skip_apply_highlight;
     }
 
     if (skip_apply_highlight) {