# Introduction The Player API is the top-level API. This API exposes: * basic functions to manipulate video playback, such as start and pause; * properties to check states and values, such as the playhead position; * events to track changes. The list below overviews how-to articles related to the Player API. * [How do you know when a stream or an advertisement is playing?](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/player/how-do-you-know-when-a-stream-or-ad-is-playing.md) * [How to measure time-to-first-frame](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/player/how-to-measure-time-to-first-frame.md) * [How can we track the first play(ing) event?](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/player/how-can-we-track-the-first-playing-event.md) * [How to track player states](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/player/how-to-track-player-states.md) ## Events As a developer, you can programmatically attach event listeners to different APIs. Event listeners are often used to [implement a custom UI](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/ui/how-to-build-chromeless-ui.md) or to [implement a custom analytics integration](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/analytics/custom-analytics-integration.md). The THEOplayer API exposes many events across different interfaces, as can be seen in the graphic below. Furthermore, most events exist in all SDKs (Web, iOS-based, Android-based and Roku). ![THEOplayer API Interfaces and Events](/pr-860/assets/images/analytics-events-185d6ab52b556af08d8300b545ae5876.png "THEOplayer API Interfaces and Events") The table below gives an overview of a subset of the available events per interface in the THEOplayer Web SDK. | Interface | Event | Description | | -------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- | | [Player](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap) | [canplay](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#canplay) | Fired when the player can resume playback of the media data. | | Player | [canplaythrough](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#canplaythrough) | Fired when the player can resume playback of the media data and buffering is unlikely. | | Player | [contentprotectionerror](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#contentprotectionerror) | Fired when an error related to content protection occurs. | | Player | [contentprotectionsuccess](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#contentprotectionsuccess) | Fired when the key is usable for decryption. | | Player | [currentsourcechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#currentsourcechange) | Fired when the current source, which is chosen from ChromelessPlayer.source.sources, changes. | | Player | [destroy](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#destroy) | Fired when the the player is destroyed. | | Player | [dimensionchange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#dimensionchange) | Fired when the dimensions of the HTML element changes. | | Player | [durationchange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#durationchange) | Fired when ChromelessPlayer.duration changes. | | Player | [emptied](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#emptied) | Fired when the player's source is cleared. | | Player | [encrypted](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#encrypted) | Fired when the player encounters key system initialization data in the media data. | | Player | [ended](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#ended) | Fired when playback has stopped because the end of the media resource was reached. | | Player | [error](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#error) | Fired when an error occurs. | | Player | [loadeddata](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#loadeddata) | Fired when the player can render the media data at the current playback position for the first time. | | Player | [loadedmetadata](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#loadedmetadata) | Fired when the player determines the duration and dimensions of the media resource. | | Player | [loadstart](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#loadstart) | Fired when the player starts loading the manifest. | | Player | [manifestupdate](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#manifestupdate) | Fired when the manifest is updated. | | Player | [pause](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#pause) | Fired when ChromelessPlayer.paused changes to true. | | Player | [play](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#play) | Fired when ChromelessPlayer.paused changes to false. | | Player | [playing](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#playing) | Fired when playback is ready to start after having been paused or delayed due to lack of media data. | | Player | [progress](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#progress) | Fired when the player loaded media data. | | Player | [ratechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#ratechange) | Fired when ChromelessPlayer.playbackRate changes. | | Player | [readystatechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#readystatechange) | Fired when ChromelessPlayer.readyState changes. | | Player | [representationchange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#representationchange) | Fired when the current representation changes. | | Player | [resize](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#resize) | Fired when either ChromelessPlayer.videoWidth or ChromelessPlayer.videoHeight changes. | | Player | [seeked](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#seeked) | Fired when ChromelessPlayer.seeking changes to false after the current playback position was changed. | | Player | [seeking](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#seeking) | Fired when ChromelessPlayer.seeking changes to true, and the player has started seeking to a new position. | | Player | [segmentnotfound](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#segmentnotfound) | Fired when a segment can not be found. | | Player | [sourcechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#sourcechange) | Fired when ChromelessPlayer.source changes. | | Player | [timeupdate](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#timeupdate) | Fired when the current playback position changed as part of normal playback or in an especially interesting way, for example discontinuously. | | Player | [volumechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#volumechange) | Fired when ChromelessPlayer.volume changes. | | Player | [waiting](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PlayerEventMap#waiting) | Fired when playback has stopped because the next frame is not available, but the player expects that frame to become available in due course. | | Player | [currentTime](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/classes/ChromelessPlayer#currenttime) | The current playback position of the media, in seconds. | | Player | [currentProgramDateTime](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/classes/ChromelessPlayer#currentprogramdatetime) | The current playback position of the media, as a timestamp. | | Player | [muted](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/classes/ChromelessPlayer#muted) | Whether audio is muted. | | Player | [...](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/classes/ChromelessPlayer) | ... | | [Ads (Client-Side)](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap) | [adbegin](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adbegin) | Fired when an ad begins. | | Ads (Client-Side) | [adbreakbegin](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adbreakbegin) | Fired when an ad break begins. | | Ads (Client-Side) | [adbreakchange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adbreakchange) | Fired when an ad break changes. | | Ads (Client-Side) | [adbreakend](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adbreakend) | Fired when an ad break ends. | | Ads (Client-Side) | [adbuffering](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adbuffering) | Fired when the ad has stalled playback to buffer. | | Ads (Client-Side) | [addad](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#addad) | Fired when an ad is added. | | Ads (Client-Side) | [addadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#addadbreak) | Fired when an ad break is added. | | Ads (Client-Side) | [adend](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adend) | Fired when an ad ends. | | Ads (Client-Side) | [aderror](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#aderror) | Fired when an ad errors. | | Ads (Client-Side) | [adfirstquartile](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adfirstquartile) | Fired when an ad reaches the first quartile. | | Ads (Client-Side) | [adimpression](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adimpression) | Fired when an ad counts as an impression. | | Ads (Client-Side) | [adloaded](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adloaded) | Fired when an ad is loaded. | | Ads (Client-Side) | [admetadata](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#admetadata) | Fired when an ads list is loaded. | | Ads (Client-Side) | [admidpoint](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#admidpoint) | Fired when an ad reaches the mid point. | | Ads (Client-Side) | [adskip](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adskip) | Fired when an ad is skipped. | | Ads (Client-Side) | [adthirdquartile](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#adthirdquartile) | Fired when an ad reaches the third quartile. | | Ads (Client-Side) | [removeadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#removeadbreak) | Fired when an ad break is removed. | | Ads (Client-Side) | [updatead](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#updatead) | Fired when an ad is updated. | | Ads (Client-Side) | [updateadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/AdsEventMap#updateadbreak) | Fired when an AdBreak is updated. | | [Vendor Cast](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VendorCastEventMap) | [statechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VendorCastEventMap#statechange) | Fired when the state changes. | | [Chromecast](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/ChromecastEventMap) | [error](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/ChromecastEventMap#error) | Fired when an error occurs while casting or trying to cast. | | [Track List](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackListEventMap) | [addtrack](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackListEventMap#addtrack) | Fired when a track is added. | | Track List | [change](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackListEventMap#change) | Fired when a track is activated or deactivated. | | Track List | [removetrack](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackListEventMap#removetrack) | Fired when a track is removed. | | [Track](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackEventMap) | [change](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackEventMap#change) | Fired when a media track's enabled or a text track's changes. | | Track | [update](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TrackEventMap#update) | Fired when the track updates. | | [Media Track](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/MediaTrackEventMap) | [activequalitychanged](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/MediaTrackEventMap#activequalitychanged) | Fired when the media track's active quality changes. | | Media Track | [qualityunavailable](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/MediaTrackEventMap#qualityunavailable) | Fired when a quality of the track becomes unavailable. | | Media Track | [targetqualitychanged](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/MediaTrackEventMap#targetqualitychanged) | Fired when the media track's target quality changes. | | [Text Track](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap) | [addcue](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#addcue) | Fired when a cue is added to the track. | | Text Track | [cuechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#cuechange) | Fired when a cue of the track changes. | | Text Track | [entercue](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#entercue) | Fired when a cue of the track enters. | | Text Track | [error](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#error) | Fired when an error occurred while loading or parsing the track. | | Text Track | [exitcue](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#exitcue) | Fired when a cue of the track exits. | | Text Track | [readystatechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#readystatechange) | Fired when the text track's changes. | | Text Track | [removecue](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#removecue) | Fired when a cue of the track is removed. | | Text Track | [typechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackEventMap#typechange) | Fired when the text track's changes. | | [Text Track Cue](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackCueEventMap) | [enter](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackCueEventMap#enter) | Fired when the cue is entered. | | Text Track Cue | [exit](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackCueEventMap#exit) | Fired when the cue is exited. | | Text Track Cue | [update](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/TextTrackCueEventMap#update) | Fired when the cue is updated. | | [Presentation](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PresentationEventMap) | [error](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PresentationEventMap#error) | Fired when an error occurs. | | Presentation | [presentationmodechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/PresentationEventMap#presentationmodechange) | Fired when the presentation mode changes. | | [VR](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VREventMap) | [directionchange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VREventMap#directionchange) | Fired when the VR.direction changes. | | VR | [error](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VREventMap#error) | Fired when an error occurs. | | VR | [statechange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VREventMap#statechange) | Fired when the VR.state changes. | | VR | [stereochange](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/VREventMap#stereochange) | Fired when the VR.stereo changes. | | [Uplynk](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkEventMap) | [assetinforesponse](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkEventMap#assetinforesponse) | Fired when an asset info response is received. | | Uplynk | [pingerror](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkEventMap#pingerror) | Fired when an error or invalid response is received from the Ping API. | | Uplynk | [pingresponse](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkEventMap#pingresponse) | Fired when a Ping response is received. | | Uplynk | [preplayresponse](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkEventMap#preplayresponse) | Fired when a Preplay response is received. | | Uplynk | [ads](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/Uplynk#ads) | The Uplynk SSAI API. | | Uplynk | [assets](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/Uplynk#assets) | List of Uplynk assets. | | [Uplynk Ad Break List](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakListEventMap) | [addadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakListEventMap#addadbreak) | Fired when the ad break is added. | | Uplynk Ad Break List | [removeadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakListEventMap#removeadbreak) | Fired when the ad break is removed. | | [Uplynk Ad Break](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakEventMap) | [adbreakbegin](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakEventMap#adbreakbegin) | Fired when the ad break begins. | | Uplynk Ad Break | [adbreakend](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakEventMap#adbreakend) | Fired when the ad break ends. | | Uplynk Ad Break | [adbreakskip](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakEventMap#adbreakskip) | Fired when the ad break is skipped. | | Uplynk Ad Break | [updateadbreak](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdBreakEventMap#updateadbreak) | Fired when the ad break is updated. | | [Uplynk Ad](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap) | [adbegin](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#adbegin) | Fired when an ad begins. | | Uplynk Ad | [adcomplete](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#adcomplete) | Fired when the ad is completed. | | Uplynk Ad | [adend](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#adend) | Fired when the ad ends. | | Uplynk Ad | [adfirstquartile](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#adfirstquartile) | Fired when the ad reaches the first quartile. | | Uplynk Ad | [admidpoint](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#admidpoint) | Fired when the ad reaches the mid point. | | Uplynk Ad | [adthirdquartile](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web/interfaces/UplynkAdEventMap#adthirdquartile) | Fired when the ad reaches the third quartile. | Our APIs are continuously evolving, and so is our list of events. Refer to our API references of our SDKs to go through the latest sets of events: * [Web SDK](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/web) * [iOS SDK](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/ios) * [Android SDK](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/api-reference/android)