anchor.diff:  
   /// HTML escape modes.
   ///
  -/// Allows specifying a mode for HTML escaping that depend on the context
  +/// Allows specifying a mode for HTML escaping that depends on the context
   /// where the escaped result is going to be used.
   /// The relevant contexts are:
   ///
  
positive.code: ///
  /// Custom escape modes can be created using the [HtmlEscapeMode.HtmlEscapeMode]
  /// constructor.
  class HtmlEscapeMode {
    final String _name;
  
  
negative.code:   ///
    /// If [mode] is provided as either [HtmlEscapeMode.attribute] or
    /// [HtmlEscapeMode.element], only the corresponding subset of HTML
    /// characters is escaped.
    /// The default is to escape all HTML characters.
    const HtmlEscape([this.mode = HtmlEscapeMode.unknown]);
  
  