diff --git a/packages/parchment/lib/src/codecs/html.dart b/packages/parchment/lib/src/codecs/html.dart
index 7320c762..a125f904 100644
--- a/packages/parchment/lib/src/codecs/html.dart
+++ b/packages/parchment/lib/src/codecs/html.dart
@@ -539,13 +539,13 @@ class _HtmlInlineTag extends _HtmlTag {
       final argb = toRGBA(value);
       return '<${_inlineAttributesParchmentToHtml[key]} '
           'style="color: '
-          'rgba(${argb[1]},${argb[2]},${argb[3]},${argb[0] / 255})">';
+          'rgba(${argb.R},${argb.G},${argb.B},${argb.A / 255})">';
     }
     if (key == ParchmentAttribute.backgroundColor.key) {
       final argb = toRGBA(value);
       return '<${_inlineAttributesParchmentToHtml[key]} '
           'style="background-color: '
-          'rgba(${argb[1]},${argb[2]},${argb[3]},${argb[0] / 255})">';
+          'rgba(${argb.R},${argb.G},${argb.B},${argb.A / 255})">';
     }
     return '<${_inlineAttributesParchmentToHtml[key]}>';
   }
diff --git a/packages/parchment/lib/src/codecs/html_utils.dart b/packages/parchment/lib/src/codecs/html_utils.dart
index 5a3380b3..4120b3e2 100644
--- a/packages/parchment/lib/src/codecs/html_utils.dart
+++ b/packages/parchment/lib/src/codecs/html_utils.dart
@@ -1,11 +1,10 @@
-// TODO: Use tuple once Parchment is ported to Dart 3
-List<int> toRGBA(int colorValue) {
-  return [
-    (0xff000000 & colorValue) >> 24,
-    (0x00ff0000 & colorValue) >> 16,
-    (0x0000ff00 & colorValue) >> 8,
-    (0x000000ff & colorValue) >> 0
-  ];
+({int R, int G, int B, int A}) toRGBA(int colorValue) {
+  return (
+    A: (0xff000000 & colorValue) >> 24,
+    R: (0x00ff0000 & colorValue) >> 16,
+    G: (0x0000ff00 & colorValue) >> 8,
+    B: (0x000000ff & colorValue) >> 0
+  );
 }
 
 int colorValueFromCSS(String cssColor) {