added xxx large

Author: DaAppLab

packages/core/lib/src/internal/ops/tag_font.dart

@@ -9,6 +9,7 @@ const kCssFontFamily = 'font-family';
 
 const kCssFontSize = 'font-size';
 const kCssFontSizeXxLarge = 'xx-large';
+const kCssFontSizeXxxLarge = 'xxx-large';
 const kCssFontSizeXLarge = 'x-large';
 const kCssFontSizeLarge = 'large';
 const kCssFontSizeMedium = 'medium';

packages/core/lib/src/internal/text_ops.dart

@@ -75,6 +75,8 @@ double? _fontSizeTryParseCssLength(InheritedProperties resolved, CssLength v) =>
 
 double? _fontSizeTryParseTerm(InheritedProperties resolved, String value) {
   switch (value) {
+    case kCssFontSizeXxxLarge:
+      return _fontSizeMultiplyRootWith(resolved, 3.0);
     case kCssFontSizeXxLarge:
       return _fontSizeMultiplyRootWith(resolved, 2.0);
     case kCssFontSizeXLarge: