code: def _vispy_set_size(self, w, h):
      self.css_width = f"{w}px"
      self.css_height = f"{h}px"
  
imports: import asyncio
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...app import Timer
  from ...util import keys
  from ._offscreen_util import OffscreenContext, FrameBufferHelper
label_desc: Use image node_id 10 for calling the CanvasBackend obj's underlying member method code with example usage: obj._vispy_set_size(w, h) without return types