Hello~
I try it in html5 target
Discovery that tf.size = 3 , But result is fault!
var txt:TextField = new TextField();
var tf:TextFormat = new TextFormat();
tf.size = 3;
tf.kerning = true;
txt.defaultTextFormat = tf;
txt.autoSize = TextFieldAutoSize.LEFT;
txt.text = "OPENFL ";
addChild( txt );