1. @DomName('SVGTextContentElement.getExtentOfChar')
  2. @DocsEditable()
Rect getExtentOfChar(int charnum)

Source 

@DomName('SVGTextContentElement.getExtentOfChar')
@DocsEditable()
Rect getExtentOfChar(int charnum) =>
    _blink.BlinkSVGTextContentElement.instance
        .getExtentOfChar_Callback_1_(this, charnum);