LibWeb: Parse view() for the animation-timeline CSS property

Author: https://github.com/Calme1709
Commit: https://github.com/LadybirdBrowser/ladybird/commit/c8d91c127ee
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6912
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/CSS/StyleValues/ViewFunctionStyleValue.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025, Callum Law <callumlaw1709@outlook.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "ViewFunctionStyleValue.h"
+
+namespace Web::CSS {
+
+String ViewFunctionStyleValue::to_string(SerializationMode mode) const
+{
+    StringBuilder builder;
+    builder.append("view("sv);
+
+    if (m_axis != Axis::Block)
+        builder.append(CSS::to_string(m_axis));
+
+    auto stringified_inset = m_inset->to_string(mode);
+
+    if (stringified_inset != "auto"sv) {
+        if (m_axis != Axis::Block)
+            builder.append(' ');
+
+        builder.append(stringified_inset);
+    }
+
+    builder.append(')');
+    return builder.to_string_without_validation();
+}
+
+ValueComparingNonnullRefPtr<StyleValue const> ViewFunctionStyleValue::absolutized(ComputationContext const& computation_context) const
+{
+    auto absolutized_inset = m_inset->absolutized(computation_context);
+
+    if (absolutized_inset == m_inset)
+        return *this;
+
+    return ViewFunctionStyleValue::create(m_axis, absolutized_inset);
+}
+
+}