1. DomName('CanvasRenderingContext2D.measureText')
  2. DocsEditable()
TextMetrics measureText(String text)

Source 

@DomName('CanvasRenderingContext2D.measureText')
@DocsEditable()
TextMetrics measureText(String text) => _blink.BlinkCanvasRenderingContext2D.instance.measureText_Callback_1_(this, text);