LibWeb: Allow multiple values for transition-behavior

Calme1709 · Calme1709 · commit ceab6d352e1b · 2025-11-24T11:23:12.000+13:00
diff --git a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
@@ -740,7 +740,8 @@ Parser::ParseErrorOr<NonnullRefPtr<StyleValue const>> Parser::parse_css_value(Pr
     case PropertyID::TransitionProperty:
         return parse_all_as(tokens, [this](auto& tokens) { return parse_transition_property_value(tokens); });
     case PropertyID::TransitionTimingFunction:
-        return parse_all_as(tokens, [this](auto& tokens) { return parse_simple_comma_separated_value_list(PropertyID::TransitionTimingFunction, tokens); });
+    case PropertyID::TransitionBehavior:
+        return parse_all_as(tokens, [this, property_id](auto& tokens) { return parse_simple_comma_separated_value_list(property_id, tokens); });
     case PropertyID::Translate:
         return parse_all_as(tokens, [this](auto& tokens) { return parse_translate_value(tokens); });
     case PropertyID::Scale:
diff --git a/Tests/LibWeb/Text/expected/css/transition-behavior-multiple.txt b/Tests/LibWeb/Text/expected/css/transition-behavior-multiple.txt
@@ -0,0 +1 @@
+#foo { transition-behavior: allow-discrete, normal; }
diff --git a/Tests/LibWeb/Text/input/css/transition-behavior-multiple.html b/Tests/LibWeb/Text/input/css/transition-behavior-multiple.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+    <style>
+        #foo {
+            transition-behavior: allow-discrete, normal;
+        }
+    </style>
+    <script src="../include.js"></script>
+    <script>
+        test(() => {
+            println(document.styleSheets[0].cssRules[0].cssText);
+        });
+    </script>
+</html>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+#foo { transition-behavior: allow-discrete, normal; }`