Note 3 Open Captions are any captions that cannot be turned off. For example, if the captions
      are visual equivalent images of text embedded in video . Note 4 Captions should not obscure or obstruct relevant information in the video. Note 5 In some countries, captions are called subtitles. Note 6 Audio descriptions can be, but do not need to be, captioned since they are descriptions of information
      that is already presented visually.