- kind initial value: 'subtitles'
- kind value after setting to "invalid": 'metadata'
- kind value after setting to "captions": 'captions'
- kind value after setting to null: 'metadata'
- kind value after setting to "CHAPTERS": 'chapters'
- kind value after setting to "": 'metadata'
- kind value after calling removeAttribute: 'subtitles'
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