Here is a 1-paragraph summary of the text: To enable participants to mute and unmute themselves in a Twilio Programmable Video app built with the JavaScript SDK, developers can attach local participant tracks to the DOM and provide interactive elements for muting and unmuting. When a user interacts with these elements, the corresponding track is disabled or enabled, emitting an event that can be listened for on the UI to update accordingly. By attaching listeners to the `disabled` and `enabled` events of each track, developers can respond to changes in real-time and update their app's UI to reflect the current state of audio and video tracks.