LibWeb/CSS: Implement the CSSImportRule.media attribute

Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/cbb169820a8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4183
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/CSS/CSSImportRule.cpp

@@ -174,6 +174,15 @@ void CSSImportRule::set_style_sheet(GC::Ref<CSSStyleSheet> style_sheet)
     m_document->invalidate_style(DOM::StyleInvalidationReason::CSSImportRule);
 }
 
+// https://drafts.csswg.org/cssom/#dom-cssimportrule-media
+GC::Ptr<MediaList> CSSImportRule::media() const
+{
+    // The media attribute must return the value of the media attribute of the associated CSS style sheet.
+    if (!m_style_sheet)
+        return nullptr;
+    return m_style_sheet->media();
+}
+
 Optional<String> CSSImportRule::supports_text() const
 {
     if (!m_supports)

Libraries/LibWeb/CSS/CSSImportRule.h

@@ -31,6 +31,7 @@ public:
 
     CSSStyleSheet* loaded_style_sheet() { return m_style_sheet; }
     CSSStyleSheet const* loaded_style_sheet() const { return m_style_sheet; }
+    GC::Ptr<MediaList> media() const;
     CSSStyleSheet* style_sheet_for_bindings() { return m_style_sheet; }
 
     Optional<String> supports_text() const;

Libraries/LibWeb/CSS/CSSImportRule.idl

@@ -6,7 +6,7 @@
 [Exposed=Window]
 interface CSSImportRule : CSSRule {
     readonly attribute USVString href;
-    // FIXME: [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+    [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
     [SameObject, ImplementedAs=style_sheet_for_bindings] readonly attribute CSSStyleSheet? styleSheet;
     [FIXME] readonly attribute CSSOMString? layerName;
     readonly attribute CSSOMString? supportsText;