From a0ba49a50ac80417c9cff3fc4f6cc17ed003f928 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 11 Apr 2022 20:48:50 +0200
Subject: [PATCH] LibWeb: Support CSSStyleDeclaration.getPropertyPriority()

---
 .../Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp     | 12 ++++++++++++
 Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h  |  1 +
 .../Libraries/LibWeb/CSS/CSSStyleDeclaration.idl     |  1 +
 3 files changed, 14 insertions(+)

diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
index d9807168c8..e8f094d52d 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
@@ -177,6 +177,18 @@ String CSSStyleDeclaration::get_property_value(StringView property_name) const
     return maybe_property->value->to_string();
 }
 
+// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-getpropertypriority
+String CSSStyleDeclaration::get_property_priority(StringView property_name) const
+{
+    auto property_id = property_id_from_string(property_name);
+    if (property_id == CSS::PropertyID::Invalid)
+        return {};
+    auto maybe_property = property(property_id);
+    if (!maybe_property.has_value())
+        return {};
+    return maybe_property->important == Important::Yes ? "important" : "";
+}
+
 DOM::ExceptionOr<void> CSSStyleDeclaration::set_property(StringView property_name, StringView css_text, StringView priority)
 {
     auto property_id = property_id_from_string(property_name);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
index 0e43db3eaf..0da22ce5b5 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
@@ -45,6 +45,7 @@ public:
     DOM::ExceptionOr<String> remove_property(StringView property_name);
 
     String get_property_value(StringView property) const;
+    String get_property_priority(StringView property) const;
 
     String css_text() const;
     void set_css_text(StringView);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.idl b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.idl
index 867d3bd1ed..c94c7ac1f3 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.idl
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.idl
@@ -5,6 +5,7 @@ interface CSSStyleDeclaration {
     CSSOMString item(unsigned long index);
 
     CSSOMString getPropertyValue(CSSOMString property);
+    CSSOMString getPropertyPriority(CSSOMString property);
 
     [CEReactions] undefined setProperty(CSSOMString property, [LegacyNullToEmptyString] CSSOMString value, [LegacyNullToEmptyString] optional CSSOMString priority = "");
     [CEReactions] CSSOMString removeProperty(CSSOMString property);