{
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            "standard_track": true,
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          }
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      },
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          },
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            "standard_track": true,
            "deprecated": false
          }
        }
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/VideoTrackList/onaddtrack",
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                {
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            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "onchange": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/VideoTrackList/onchange",
          "support": {
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            "standard_track": true,
            "deprecated": false
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            "standard_track": true,
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/VideoTrackList/selectedIndex",
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            "standard_track": true,
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}