code: func (c *CSS) SetKeyframeKey(styleSheetId string, theRange *CSSSourceRange, keyText string) (*CSSValue, error) {
  	var v CSSSetKeyframeKeyParams
  	v.StyleSheetId = styleSheetId
  	v.TheRange = theRange
  	v.KeyText = keyText
  	return c.SetKeyframeKeyWithParams(&v)
  }
docs: // SetKeyframeKey - Modifies the keyframe rule key text.
  // styleSheetId -
  // range -
  // keyText -
  // Returns -  keyText - The resulting key text after modification.