HtmlElement `style` property naming in Dart

main.dart

import 'dart:html';

void main() {
  var div = document.createElement('div');
  print('1. div.style.fontSize = ${div.style.fontSize}');
	div.style.fontSize = "120%";
  print('2. div.style.fontSize = ${div.style.fontSize}');
  /*
   * div.style[] results in warning: 
   * The operator '[]=' is not defined for the class 'CssStyleDeclaration'.
   */
  // div.style['fontSize'] = "130%";
  // div.style['font-size'] = "140%";
}