From 85356094b50878e78d40d79c2a9e96ff9aac5a6b Mon Sep 17 00:00:00 2001
From: Ankush Chatterjee <ac.ankush15@gmail.com>
Date: Wed, 23 Oct 2024 22:15:19 +0530
Subject: [PATCH] LibWeb/CSS: Add math expression support for transform-origin

---
 Tests/LibWeb/Text/expected/css/calc-coverage.txt  | 4 ++--
 Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp   | 3 +++
 Userland/Libraries/LibWeb/CSS/StyleProperties.cpp | 2 ++
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Tests/LibWeb/Text/expected/css/calc-coverage.txt b/Tests/LibWeb/Text/expected/css/calc-coverage.txt
index 4d1b0a0ec45..48c1305f8aa 100644
--- a/Tests/LibWeb/Text/expected/css/calc-coverage.txt
+++ b/Tests/LibWeb/Text/expected/css/calc-coverage.txt
@@ -138,8 +138,8 @@ text-indent: 'calc(2%)' -> 'calc(2%)'
 text-indent: 'calc(2% * var(--n))' -> '4%'
 top: 'calc(2%)' -> 'calc(2%)'
 top: 'calc(2% * var(--n))' -> '4%'
-transform-origin: 'calc(2px) calc(2%)' -> '50% 50%'
-transform-origin: 'calc(2px * var(--n)) calc(2% * var(--n))' -> '50% 50%'
+transform-origin: 'calc(2px) calc(2%)' -> 'calc(2px) calc(2%)'
+transform-origin: 'calc(2px * var(--n)) calc(2% * var(--n))' -> 'calc(2px * 2) 4%'
 transition-delay: 'calc(2s)' -> 'calc(2s)'
 transition-delay: 'calc(2s * var(--n))' -> '4s'
 transition-duration: 'calc(2s)' -> 'calc(2s)'
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index c8d104df621..0fca06f5ee9 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -6929,6 +6929,9 @@ RefPtr<CSSStyleValue> Parser::parse_transform_origin_value(TokenStream<Component
                 return OptionalNone {};
             }
         }
+        if (value->is_math()) {
+            return AxisOffset { Axis::None, value->as_math() };
+        }
         return OptionalNone {};
     };
 
diff --git a/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp b/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
index 5dee90a0a44..62eea1997d1 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
@@ -534,6 +534,8 @@ static Optional<LengthPercentage> length_percentage_for_style_value(CSSStyleValu
         return value.as_length().length();
     if (value.is_percentage())
         return value.as_percentage().percentage();
+    if (value.is_math())
+        return LengthPercentage { const_cast<CSSMathValue&>(value.as_math()) };
     return {};
 }