Documentation updates: * Updated [TextTrack.mode](https://wiki.developer.mozilla.org/en-US/docs/Web/API/TextTrack/mode) for bug 1550633; also added example. * Updated [TextTrack](https://wiki.developer.mozilla.org/en-US/docs/Web/API/TextTrack) for bug 1550633. * Updated Firefox 69 for developers
Bug 1550633 Comment 43 Edit History
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Documentation updates: * Updated [TextTrack.mode](https://wiki.developer.mozilla.org/en-US/docs/Web/API/TextTrack/mode) for bug 1550633; also added example. * Updated [TextTrack](https://wiki.developer.mozilla.org/en-US/docs/Web/API/TextTrack) for bug 1550633. * Submitted [BCD PR 4579](https://github.com/mdn/browser-compat-data/pull/4579) with the `TextTrack` updates * Updated Firefox 69 for developers