1 files changed, 38 insertions, 2 deletions

diff --git a/chromium/third_party/blink/renderer/core/css/properties/longhands/custom_property_test.cc b/chromium/third_party/blink/renderer/core/css/properties/longhands/custom_property_test.cc
index 9819322441e..1b206d574c5 100644
--- a/chromium/third_party/blink/renderer/core/css/properties/longhands/custom_property_test.cc
+++ b/chromium/third_party/blink/renderer/core/css/properties/longhands/custom_property_test.cc
@@ -29,9 +29,13 @@ class CustomPropertyTest : public PageTestBase {
     UpdateAllLifecyclePhasesForTest();
   }
 
-  const CSSValue* GetComputedValue(const CustomProperty& property) {
+  const ComputedStyle& GetComputedStyle() {
     Element* node = GetDocument().getElementById("target");
-    return property.CSSValueFromComputedStyle(node->ComputedStyleRef(),
+    return node->ComputedStyleRef();
+  }
+
+  const CSSValue* GetComputedValue(const CustomProperty& property) {
+    return property.CSSValueFromComputedStyle(GetComputedStyle(),
                                               nullptr /* layout_object */,
                                               false /* allow_visited_style */);
   }
@@ -82,6 +86,38 @@ TEST_F(CustomPropertyTest, GetPropertyNameAtomicString) {
   EXPECT_EQ(AtomicString("--x"), property.GetPropertyNameAtomicString());
 }
 
+TEST_F(CustomPropertyTest, ComputedValuesEqual) {
+  RegisterProperty(GetDocument(), "--y", "<length>", "100px", false);
+
+  CustomProperty x("--x", GetDocument());
+  CustomProperty y("--y", GetDocument());
+
+  SetElementWithStyle("--x:foo;--y:10px");
+  auto style1 = ComputedStyle::Clone(GetComputedStyle());
+
+  SetElementWithStyle("--x:foo;--y:10px");
+  auto style2 = ComputedStyle::Clone(GetComputedStyle());
+
+  SetElementWithStyle("--x:bar;--y:30px");
+  auto style3 = ComputedStyle::Clone(GetComputedStyle());
+
+  ASSERT_TRUE(x.IsComputedValueComparable());
+  EXPECT_TRUE(x.ComputedValuesEqual(*style1, *style1));
+  EXPECT_TRUE(x.ComputedValuesEqual(*style2, *style2));
+  EXPECT_TRUE(x.ComputedValuesEqual(*style1, *style2));
+  EXPECT_TRUE(x.ComputedValuesEqual(*style2, *style1));
+  EXPECT_FALSE(x.ComputedValuesEqual(*style1, *style3));
+  EXPECT_FALSE(x.ComputedValuesEqual(*style2, *style3));
+
+  ASSERT_TRUE(y.IsComputedValueComparable());
+  EXPECT_TRUE(y.ComputedValuesEqual(*style1, *style1));
+  EXPECT_TRUE(y.ComputedValuesEqual(*style2, *style2));
+  EXPECT_TRUE(y.ComputedValuesEqual(*style1, *style2));
+  EXPECT_TRUE(y.ComputedValuesEqual(*style2, *style1));
+  EXPECT_FALSE(y.ComputedValuesEqual(*style1, *style3));
+  EXPECT_FALSE(y.ComputedValuesEqual(*style2, *style3));
+}
+
 TEST_F(CustomPropertyTest, ComputedCSSValueUnregistered) {
   CustomProperty property("--x", GetDocument());
   SetElementWithStyle("--x:foo");