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If the element'spausedp352

attribute is false, the user agent mustqueue a taskp843

tonotify about playingp354

for the element.

↪

If the new ready state isHAVE_ENOUGH_DATAp350

If the previous ready state wasHAVE_CURRENT_DATAp350

or less, the user agent mustqueue a taskp843

tofire a simple

eventp854

namedcanplayp383

at the element, and, if the element'spausedp352

attribute is false,queue a taskp843

tonotify

about playingp354

for the element.

If theautoplaying flagp337

is true, and thepausedp352

attribute is true, and themedia elementp333

has anautoplayp351

attribute specified, and themedia elementp333

'snode document

'sactive sandboxing flag setp773

does not have thesandboxed

automatic features browsing context flagp771

set, then the user agent may also run the following substeps:

1. Set thepausedp352

attribute to false.

2. If the element'sshow poster flagp348

is true, set it to false and run thetime marches onp356

steps.

3. Queue a taskp843

tofire a simple eventp854

namedplayp384

at the element.

4. Queue a taskp843

tonotify about playingp354

for the element.

5. Set theautoplaying flagp337

to false.

In any case, the user agent must finallyqueue a taskp843

tofire a simple eventp854

namedcanplaythroughp383

at the

element.

ThereadyStateIDL attribute must, on getting, return the value described above that describes the current ready state of themedia elementp333

Theautoplayattribute is aboolean attributep65

. When present, the user agent (as described in the algorithm described herein) will automatically

begin playback of themedia resourcep334

as soon as it can do so without stopping.

TheautoplayIDL attribute mustreflectp89

the content attribute of the same name.

4.8.12.8 Playing the media resource

User agents do not need to support autoplay, and it is suggested that user agents honor user preferences on the

matter. Authors are urged to use theautoplayp351

attribute rather than using script to force the video to play, so as

to allow the user to override the behaviour if so desired.

Note

It is possible for the ready state of a media element to jump between these states discontinuously. For example, the state of a media

element can jump straight fromHAVE_METADATAp349

toHAVE_ENOUGH_DATAp350

without passing through theHAVE_CURRENT_DATAp350

andHAVE_FUTURE_DATAp350

states.

Note

Authors are urged to use theautoplayp351

attribute rather than using script to trigger automatic playback, as this allows the user to

override the automatic playback when it is not desired, e.g. when using a screen reader. Authors are also encouraged to consider not

using the automatic playback behaviour at all, and instead to let the user agent wait for the user to start playback explicitly.

Note

media.pausedp352

Returns true if playback is paused; false otherwise.

media.endedp352

Returns true if playback has reached the end of themedia resourcep334

media.defaultPlaybackRatep353 [ =value]

Returns the default rate of playback, for when the user is not fast-forwarding or reversing through themedia resourcep334

Can be set, to change the default rate of playback.

The default rate has no direct effect on playback, but if the user switches to a fast-forward mode, when they return to the normal

playback mode, it is expected that the rate of playback will be returned to the default rate of playback.

Note

Spec bugs:28032

⋰

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Thepausedattribute represents whether themedia elementp333

is paused or not. The attribute must initially be true.

Amedia elementp333

is ablocked media elementif itsreadyStatep351

attribute is in theHAVE_NOTHINGp349

state, theHAVE_METADATAp349

state, or theHAVE_CURRENT_DATAp350

state, or if the element haspaused for user interactionp352

orpaused for in-band contentp353

Amedia elementp333

is said to bepotentially playingwhen itspausedp352

attribute is false, the element has notended playbackp352

, playback has

notstopped due to errorsp352

, and the element is not ablocked media elementp352

Amedia elementp333

is said to haveended playbackwhen:

• The element'sreadyStatep351

attribute isHAVE_METADATAp349

or greater, and

• Either:

◦ Thecurrent playback positionp348

is the end of themedia resourcep334

, and

◦ Thedirection of playbackp355

is forwards, and

◦ Themedia elementp333

does not have aloopp349

attribute specified.

Or:

◦ Thecurrent playback positionp348

is theearliest possible positionp348

, and

◦ Thedirection of playbackp355

is backwards.

Theendedattribute must return true if, the last time theevent loopp842

reachedstep 1p843

, themedia elementp333

hadended playbackp352

and the

direction of playbackp355

was forwards, and false otherwise.

Amedia elementp333

is said to havestopped due to errorswhen the element'sreadyStatep351

attribute isHAVE_METADATAp349

or greater, and

the user agentencounters a non-fatal errorp346

during the processing of themedia datap334

, and due to that error, is not able to play the content at

thecurrent playback positionp348

Amedia elementp333

is said to havepaused for user interactionwhen itspausedp352

attribute is false, thereadyStatep351

attribute is either

HAVE_FUTURE_DATAp350

orHAVE_ENOUGH_DATAp350

and the user agent has reached a point in themedia resourcep334

where the user has to

make a selection for the resource to continue.

It is possible for amedia elementp333

to have bothended playbackp352

andpaused for user interactionp352

at the same time.

When amedia elementp333

that ispotentially playingp352

stops playing because it haspaused for user interactionp352

, the user agent mustqueue a

taskp843

tofire a simple eventp854

namedtimeupdatep384

at the element.

media.playbackRatep353 [ =value]

Returns the current rate playback, where 1.0 is normal speed.

Can be set, to change the rate of playback.

media.playedp353

Returns aTimeRangesp381

object that represents the ranges of themedia resourcep334

that the user agent has played.

media.playp354()

Sets thepausedp352

attribute to false, loading themedia resourcep334

and beginning playback if necessary. If the playback had ended,

will restart it from the start.

media.pausep354()

Sets thepausedp352

attribute to true, loading themedia resourcep334

if necessary.

Awaitingp383

DOM eventcan be firedp350

as a result of an element that ispotentially playingp352

stopping playback due to its

readyStatep351

attribute changing to a value lower thanHAVE_FUTURE_DATAp350

Note

352

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Amedia elementp333

is said to havepaused for in-band contentwhen itspausedp352

attribute is false, thereadyStatep351

attribute is either

HAVE_FUTURE_DATAp350

orHAVE_ENOUGH_DATAp350

and the user agent has suspended playback of themedia resourcep334

in order to play

content that is temporally anchored to themedia resourcep334

and has a non-zero length, or to play content that is temporally anchored to a

segment of themedia resourcep334

but has a length longer than that segment.

When thecurrent playback positionp348

reaches the end of themedia resourcep334

when thedirection of playbackp355

is forwards, then the user

agent must follow these steps:

1. If themedia elementp333

has aloopp349

attribute specified, thenseekp358

to theearliest possible positionp348

of themedia resourcep334

and abort these steps.

2. As defined above, theendedp352

IDL attribute starts returning true once theevent loopp842

returns tostep 1p843

3. Queue a taskp843

tofire a simple eventp854

namedtimeupdatep384

at themedia elementp333

4. Queue a taskp843

that, if themedia elementp333

has stillended playbackp352

, and thedirection of playbackp355

is still forwards, and

pausedp352

is false, changespausedp352

to true andfires a simple eventp854

namedpausep384

at themedia elementp333

5. Queue a taskp843

tofire a simple eventp854

namedendedp384

at themedia elementp333

When thecurrent playback positionp348

reaches theearliest possible positionp348

of themedia resourcep334

when thedirection of playbackp355

backwards, then the user agent must onlyqueue a taskp843

tofire a simple eventp854

namedtimeupdatep384

at the element.

ThedefaultPlaybackRateattribute gives the desired speed at which themedia resourcep334

is to play, as a multiple of its intrinsic speed. The

attribute is mutable: on getting it must return the last value it was set to, or 1.0 if it hasn't yet been set; on setting the attribute must be set to the new

value.

TheplaybackRateattribute gives the effective playback rate, which is the speed at which themedia resourcep334

plays, as a multiple of its

intrinsic speed. If it is not equal to thedefaultPlaybackRatep353

, then the implication is that the user is using a feature such as fast forward or

slow motion playback. The attribute is mutable: on getting it must return the last value it was set to, or 1.0 if it hasn't yet been set; on setting the

attribute must be set to the new value, and the playback will change speed (if the element ispotentially playingp352

When thedefaultPlaybackRatep353

orplaybackRatep353

attributes change value (either by being set by script or by being changed directly by

the user agent, e.g. in response to user control) the user agent mustqueue a taskp843

tofire a simple eventp854

namedratechangep384

at the

media elementp333

Theplayedattribute must return a new staticnormalisedTimeRangesobjectp382

that represents the ranges of points on themedia timelinep347

themedia resourcep334

reached through the usual monotonic increase of thecurrent playback positionp348

during normal playback, if any, at the time

the attribute is evaluated.

Eachmedia elementp333

has alist of pending play promises, which must initially be empty.

Toresolve pending play promisesfor amedia elementp333

, the user agent must run the following steps:

1. For each promise in themedia elementp333

'slist of pending play promisesp353

, resolve it with undefined.

2. Clear themedia elementp333

'slist of pending play promisesp353

Toreject pending play promisesfor amedia elementp333

with an exception nameerror, the user agent must run the following steps:

One example of when amedia elementp333

would bepaused for in-band contentp353

is when the user agent is playingaudio

descriptionsp331

from an external WebVTT file, and the synthesized speech generated for a cue is longer than the time between thetext

track cue start timep366

and thetext track cue end timep366

Example

The word "reaches" here does not imply that thecurrent playback positionp348

needs to have changed during normal playback; it could be

viaseekingp358

, for instance.

Note

ThedefaultPlaybackRatep353

is used by the user agent when itexposes a user interface to the userp380

Note

353

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1. For each promise in themedia elementp333

'slist of pending play promisesp353

, reject it with anerrorexception.

2. Clear themedia elementp333

'slist of pending play promisesp353

Tonotify about playingfor amedia elementp333

, the user agent must run the following steps:

1. Fire a simple eventp854

namedplayingp383

at the element.

2. Resolve pending play promisesp353

When theplay()method on amedia elementp333

is invoked, the user agent must run the following steps.

1. Optionally, if the user agent or the system does not allow media playback in the current context, return a promise rejected with a

"NotAllowedError"

DOMException

and abort these steps.

2. If themedia elementp333

'serrorp334

attribute is not null and itscodep335

attribute has the value

MEDIA_ERR_SRC_NOT_SUPPORTEDp335

, return a promise rejected with a"NotSupportedError"

DOMException

and abort these

steps.

3. Letpromisebe a new promise and appendpromiseto thelist of pending play promisesp353

4. If themedia elementp333

'snetworkStatep337

attribute has the valueNETWORK_EMPTYp337

, invoke themedia elementp333

'sresource

selection algorithmp338

5. If theplayback has endedp352

and thedirection of playbackp355

is forwards,seekp358

to theearliest possible positionp348

of themedia

resourcep334

6. If themedia elementp333

'spausedp352

attribute is true, run the following substeps:

1. Change the value ofpausedp352

to false.

2. If theshow poster flagp348

is true, set the element'sshow poster flagp348

to false and run thetime marches onp356

steps.

3. Queue a taskp843

tofire a simple eventp854

namedplayp384

at the element.

4. If themedia elementp333

'sreadyStatep351

attribute has the valueHAVE_NOTHINGp349

,HAVE_METADATAp349

, or

HAVE_CURRENT_DATAp350

,queue a taskp843

tofire a simple eventp854

namedwaitingp383

at the element.

Otherwise, themedia elementp333

'sreadyStatep351

attribute has the valueHAVE_FUTURE_DATAp350

HAVE_ENOUGH_DATAp350

:queue a taskp843

tonotify about playingp354

for the element.

7. Otherwise, if themedia elementp333

'sreadyStatep351

attribute has the valueHAVE_FUTURE_DATAp350

orHAVE_ENOUGH_DATAp350

queue a taskp843

toresolve pending play promisesp353

8. Set themedia elementp333

'sautoplaying flagp337

to false.

9. Returnpromise.

When thepause()method is invoked, and when the user agent is required to pause themedia elementp333

, the user agent must run the following

steps:

1. If themedia elementp333

'snetworkStatep337

attribute has the valueNETWORK_EMPTYp337

, invoke themedia elementp333

'sresource

selection algorithmp338

For example, a user agent could require user interaction in order to start playback. This specification does not require any

particular behaviour.

Note

This means that thededicated media source failure stepsp340

have run. Playback is not possible until themedia element load

algorithmp337

clears theerrorp334

attribute.

Note

Thiswill causep358

the user agent toqueue a taskp843

tofire a simple eventp854

namedtimeupdatep384

at themedia

elementp333

Note

The media element is already playing. However, it's possible thatpromisewill berejectedp353

before the queued task is run.

Note

354

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2. Run theinternal pause stepsp355

for themedia elementp333

Theinternal pause stepsfor amedia elementp333

are as follows:

1. Set themedia elementp333

'sautoplaying flagp337

to false.

2. If themedia elementp333

'spausedp352

attribute is false, run the following steps:

1. Change the value ofpausedp352

to true.

2. Queue a taskp843

to:

1. Fire a simple eventp854

namedtimeupdatep384

at the element.

2. Fire a simple eventp854

namedpausep384

at the element.

3. Reject pending play promisesp353

with an"AbortError"

DOMException

3. Set theofficial playback positionp348

to thecurrent playback positionp348

If the element'splaybackRatep353

is positive or zero, then thedirection of playbackis forwards. Otherwise, it is backwards.

When amedia elementp333

ispotentially playingp352

and itsDocumentp103

is afully activep749

Documentp103

, itscurrent playback positionp348

must

increase monotonically at the element'splaybackRatep353

units of media time per unit time of themedia timelinep347

's clock. (This specification

always refers to this as anincrease, but that increase could actually be adecrease if the element'splaybackRatep353

is negative.)

Any time the user agentprovides a stable statep845

, theofficial playback positionp348

must be set to thecurrent playback positionp348

While thedirection of playbackp355

is backwards, any corresponding audio must bemutedp381

. While the element'splaybackRatep353

is so low or

so high that the user agent cannot play audio usefully, the corresponding audio must also bemutedp381

. If the element'splaybackRatep353

is not

1.0, the user agent may apply pitch adjustments to the audio as necessary to render it faithfully.

Media elementsp333

that arepotentially playingp352

while notin aDocument

must not play any video, but should play any audio component. Media

elements must not stop playing just because all references to them have been removed; only once a media element is in a state where no further

audio could ever be played by that element may the element be garbage collected.

Eachmedia elementp333

has alist of newly introduced cues, which must be initially empty. Whenever atext track cuep366

is added to thelist of

cuesp365

of atext trackp363

that is in thelist of text tracksp363

for amedia elementp333

, thatcuep366

must be added to themedia elementp333

'slist of

newly introduced cuesp355

. Whenever atext trackp363

is added to thelist of text tracksp363

for amedia elementp333

, all of thecuesp366

in thattext

trackp363

'slist of cuesp365

must be added to themedia elementp333

'slist of newly introduced cuesp355

. When amedia elementp333

'slist of newly

introduced cuesp355

has new cues added while themedia elementp333

'sshow poster flagp348

is not set, then the user agent must run thetime

marches onp356

steps.

When atext track cuep366

is removed from thelist of cuesp365

of atext trackp363

that is in thelist of text tracksp363

for amedia elementp333

, and

whenever atext trackp363

is removed from thelist of text tracksp363

of amedia elementp333

, if themedia elementp333

'sshow poster flagp348

is not set,

then the user agent must run thetime marches onp356

steps.

The element'splaybackRatep353

can be 0.0, in which case thecurrent playback positionp348

doesn't move, despite playback not being

paused (pausedp352

doesn't become true, and thepausep384

event doesn't fire).

Note

This specification doesn't define how the user agent achieves the appropriate playback rate — depending on the protocol and media

available, it is plausible that the user agent could negotiate with the server to have the server provide the media data at the appropriate

rate, so that (except for the period between when the rate is changed and when the server updates the stream's playback rate) the client

doesn't actually have to drop or interpolate any frames.

Note

It is possible for an element to which no explicit references exist to play audio, even if such an element is not still actively playing: for

instance, it could be unpaused but stalled waiting for content to buffer, or it could be still buffering, but with asuspendp383

event listener

that begins playback. Even a media element whosemedia resourcep334

has no audio tracks could eventually play audio again if it had an

event listener that changes themedia resourcep334

Note

Spec bugs:28236

⋰

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When thecurrent playback positionp348

of amedia elementp333

changes (e.g. due to playback or seeking), the user agent must run thetime marches

onp356

steps. If thecurrent playback positionp348

changes while the steps are running, then the user agent must wait for the steps to complete, and

then must immediately rerun the steps. (These steps are thus run as often as possible or needed — if one iteration takes a long time, this can

cause certaincuesp366

to be skipped over as the user agent rushes ahead to "catch up".)

Thetime marches onsteps are as follows:

1. Letcurrent cuesbe a list ofcuesp366

, initialised to contain all thecuesp366

of all thehiddenp365

orshowingp365

text tracksp363

of themedia

elementp333

(not thedisabledp364

ones) whosestart timesp366

are less than or equal to thecurrent playback positionp348

and whoseend

timesp366

are greater than thecurrent playback positionp348

2. Letother cuesbe a list ofcuesp366

, initialised to contain all thecuesp366

ofhiddenp365

andshowingp365

text tracksp363

of themedia

elementp333

that are not present incurrent cues.

3. Letlast timebe thecurrent playback positionp348

at the time this algorithm was last run for thismedia elementp333

, if this is not the first

time it has run.

4. If thecurrent playback positionp348

has, since the last time this algorithm was run, only changed through its usual monotonic increase

during normal playback, then letmissed cuesbe the list ofcuesp366

inother cueswhosestart timesp366

are greater than or equal tolast

timeand whoseend timesp366

are less than or equal to thecurrent playback positionp348

. Otherwise, letmissed cuesbe an empty list.

5. Remove all thecuesp366

inmissed cuesthat are also in themedia elementp333

'slist of newly introduced cuesp355

, and then empty the

element'slist of newly introduced cuesp355

6. If the time was reached through the usual monotonic increase of thecurrent playback positionp348

during normal playback, and if the

user agent has not fired atimeupdatep384

event at the element in the past 15 to 250ms and is not still running event handlers for such

an event, then the user agent mustqueue a taskp843

tofire a simple eventp854

namedtimeupdatep384

at the element. (In the other

cases, such as explicit seeks, relevant events get fired as part of the overall process of changing thecurrent playback positionp348

7. If all of thecuesp366

incurrent cueshave theirtext track cue active flagp366

set, none of thecuesp366

inother cueshave theirtext track

cue active flagp366

set, andmissed cuesis empty, then abort these steps.

8. If the time was reached through the usual monotonic increase of thecurrent playback positionp348

during normal playback, and there are

cuesp366

inother cuesthat have theirtext track cue pause-on-exit flagp366

set and that either have theirtext track cue active flagp366

set

or are also inmissed cues, thenimmediatelyp42

pausep354

themedia elementp333

9. Leteventsbe a list oftasksp842

, initially empty. Eachtaskp842

in this list will be associated with atext trackp363

, atext track cuep366

, and a

time, which are used to sort the list before thetasksp842

are queued.

Letaffected tracksbe a list oftext tracksp363

, initially empty.

When the steps below say toprepare an eventnamedeventfor atext track cuep366

targetwith a timetime, the user agent must run

these substeps:

1. Lettrackbe thetext trackp363

with which thetext track cuep366

targetis associated.

2. Create ataskp842

tofire a simple eventp854

namedeventattarget.

3. Add the newly createdtaskp842

toevents, associated with the timetime, thetext trackp363

track, and thetext track cuep366

target.

4. Addtracktoaffected tracks.

10. For eachtext track cuep366

inmissed cues,prepare an eventp356

namedenterp384

for theTextTrackCuep375

object with thetext track

cue start timep366

11. For eachtext track cuep366

inother cuesthat either has itstext track cue active flagp366

set or is inmissed cues,prepare an eventp356

namedexitp384

for theTextTrackCuep375

object with the later of thetext track cue end timep366

and thetext track cue start timep366

The event thus is not to be fired faster than about 66Hz or slower than 4Hz (assuming the event handlers don't take longer than

250ms to run). User agents are encouraged to vary the frequency of the event based on the system load and the average cost

of processing the event each time, so that the UI updates are not any more frequent than the user agent can comfortably

handle while decoding the video.

Note

In the other cases, such as explicit seeks, playback is not paused by going past the end time of acuep366

, even if thatcuep366

has itstext track cue pause-on-exit flagp366

set.

Note

356

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12. For eachtext track cuep366

incurrent cuesthat does not have itstext track cue active flagp366

set,prepare an eventp356

namedenterp384

for theTextTrackCuep375

object with thetext track cue start timep366

13. Sort thetasksp842

ineventsin ascending time order (tasksp842

with earlier times first).

Further sorttasksp842

ineventsthat have the same time by the relativetext track cue orderp366

of thetext track cuesp366

associated with

thesetasksp842

Finally, sorttasksp842

ineventsthat have the same time and sametext track cue orderp366

by placingtasksp842

that fireenterp384

events

before those that fireexitp384

events.

14. Queuep843

eachtaskp842

inevents, in list order.

15. Sortaffected tracksin the same order as thetext tracksp363

appear in themedia elementp333

'slist of text tracksp363

, and remove

duplicates.

16. For eachtext trackp363

inaffected tracks, in the list order,queue a taskp843

tofire a simple eventp854

namedcuechangep384

at the

TextTrackp371

object, and, if thetext trackp363

has a correspondingtrackp330

element, to thenfire a simple eventp854

named

cuechangep384

at thetrackp330

element as well.

17. Set thetext track cue active flagp366

of all thecuesp366

in thecurrent cues, and unset thetext track cue active flagp366

of all thecuesp366

theother cues.

18. Run therules for updating the text track renderingp365

of each of thetext tracksp363

inaffected tracksthat areshowingp365

, providing the

text trackp363

'stext track languagep364

as the fallback language if it is not the empty string. For example, fortext tracksp363

based on

WebVTT, therules for updating the display of WebVTT text tracksp58

.[WEBVTT]p1164

For the purposes of the algorithm above, atext track cuep366

is considered to be part of atext trackp363

only if it is listed in thetext track list of

cuesp365

, not merely if it is associated with thetext trackp363

When amedia elementp333

isremoved from aDocumentp43

, the user agent must run the following steps:

1. Await a stable statep845

, allowing thetaskp842

that removed themedia elementp333

from theDocumentp103

to continue. Thesynchronous

sectionp845

consists of all the remaining steps of this algorithm. (Steps in thesynchronous sectionp845

are marked with ⌛.)

2. ⌛ If themedia elementp333

isin aDocument

, abort these steps.

3. ⌛ Run theinternal pause stepsp355

for themedia elementp333

4.8.12.9 Seeking

Theseekingattribute must initially have the value false.

ThefastSeek()method mustseekp358

to the time given by the method's argument, with theapproximate-for-speedflag set.

If themedia elementp333

'snode document

stops being afully activep749

document, then the playback willstopp355

until the document is

active again.

Note

media.seekingp357

Returns true if the user agent is currently seeking.

media.seekablep358

Returns aTimeRangesp381

object that represents the ranges of themedia resourcep334

to which it is possible for the user agent to seek.

media.fastSeekp357(time)

Seeks to near the giventimeas fast as possible, trading precision for speed. (To seek to a precise time, use thecurrentTimep348

attribute.)

This does nothing if the media resource has not been loaded.

Note

357

When the user agent is required toseekto a particularnew playback positionin themedia resourcep334

, optionally with theapproximate-for-speed

flag set, it means that the user agent must run the following steps. This algorithm interacts closely with theevent loopp842

mechanism; in particular, it

has asynchronous sectionp845

(which is triggered as part of theevent loopp842

algorithm). Steps in that section are marked with ⌛.

1. Set themedia elementp333

'sshow poster flagp348

to false.

2. If themedia elementp333

'sreadyStatep351

isHAVE_NOTHINGp349

, abort these steps.

3. If the element'sseekingp357

IDL attribute is true, then another instance of this algorithm is already running. Abort that other instance of

the algorithm without waiting for the step that it is running to complete.

4. Set theseekingp357

IDL attribute to true.

5. If the seek was in response to a DOM method call or setting of an IDL attribute, then continue the script. The remainder of these steps

must be runin parallelp42

. With the exception of the steps marked with ⌛, they could be aborted at any time by another instance of this

algorithm being invoked.

6. If thenew playback positionis later than the end of themedia resourcep334

, then let it be the end of themedia resourcep334

instead.

7. If thenew playback positionis less than theearliest possible positionp348

, let it be that position instead.

8. If the (possibly now changed)new playback positionis not in one of the ranges given in theseekablep358

attribute, then let it be the

position in one of the ranges given in theseekablep358

attribute that is the nearest to thenew playback position. If two positions both

satisfy that constraint (i.e. thenew playback positionis exactly in the middle between two ranges in theseekablep358

attribute) then use

the position that is closest to thecurrent playback positionp348

. If there are no ranges given in theseekablep358

attribute then set the

seekingp357

IDL attribute to false and abort these steps.

9. If theapproximate-for-speedflag is set, adjust thenew playback positionto a value that will allow for playback to resume promptly. If

new playback positionbefore this step is beforecurrent playback positionp348

, then the adjustednew playback positionmust also be

before thecurrent playback positionp348

. Similarly, if thenew playback positionbefore this step is aftercurrent playback positionp348

, then

the adjustednew playback positionmust also be after thecurrent playback positionp348

10. Queue a taskp843

tofire a simple eventp854

namedseekingp384

at the element.

11. Set thecurrent playback positionp348

to thenew playback position.

12. Wait until the user agent has established whether or not themedia datap334

for thenew playback positionis available, and, if it is, until it

has decoded enough data to play back that position.

13. Await a stable statep845

. Thesynchronous sectionp845

consists of all the remaining steps of this algorithm. (Steps in thesynchronous

sectionp845

are marked with ⌛.)

14. ⌛ Set theseekingp357

IDL attribute to false.

15. ⌛ Run thetime marches onp356

steps.

16. ⌛Queue a taskp843

tofire a simple eventp854

namedtimeupdatep384

at the element.

17. ⌛Queue a taskp843

tofire a simple eventp854

namedseekedp384

at the element.

Theseekableattribute must return a new staticnormalisedTimeRangesobjectp382

that represents the ranges of themedia resourcep334

, if any,

that the user agent is able to seek to, at the time the attribute is evaluated.

For example, the user agent could snap to a nearby key frame, so that it doesn't have to spend time decoding then discarding

intermediate frames before resuming playback.

Example

If themedia elementp333

waspotentially playingp352

immediately before it started seeking, but seeking caused itsreadyStatep351

attribute to change to a value lower thanHAVE_FUTURE_DATAp350

, then awaitingp383

eventwill be firedp350

at the element.

Note

This step sets thecurrent playback positionp348

, and thus can immediately trigger other conditions, such as the rules regarding when

playback "reaches the end of the media resourcep353

" (part of the logic that handles looping), even before the user agent is actually

able to render the media data for that position (as determined in the next step).

Note

ThecurrentTimep348

attribute returns theofficial playback positionp348

, not thecurrent playback positionp348

, and therefore gets

updated before script execution, separate from this algorithm.

Note

Spec bugs:28929

⋰

358

User agents should adopt a very liberal and optimistic view of what is seekable. User agents should also buffer recent content where possible to

enable seeking to be fast.

Media resourcesp334

might be internally scripted or interactive. Thus, amedia elementp333

could play in a non-linear fashion. If this happens, the

user agent must act as if the algorithm forseekingp358

was used whenever thecurrent playback positionp348

changes in a discontinuous fashion (so

that the relevant events fire).

4.8.12.10 Media resources with multiple media tracks

Amedia resourcep334

can have multiple embedded audio and video tracks. For example, in addition to the primary video and audio tracks, amedia

resourcep334

could have foreign-language dubbed dialogues, director's commentaries, audio descriptions, alternative angles, or sign-language

overlays.

TheaudioTracksattribute of amedia elementp333

must return alivep44

AudioTrackListp359

object representing the audio tracks available in the

media elementp333

'smedia resourcep334

ThevideoTracksattribute of amedia elementp333

must return alivep44

VideoTrackListp360

object representing the video tracks available in the

media elementp333

'smedia resourcep334

4.8.12.10.1AudioTrackListp359

andVideoTrackListp360

objects

TheAudioTrackListp359

andVideoTrackListp360

interfaces are used by attributes defined in the previous section.

interface AudioTrackList : EventTarget

{

readonly attribute unsigned long g length

;

getter AudioTrack

(unsigned long index);

AudioTrack

? getTrackById

(DOMString id);

If the user agent can seek to anywhere in themedia resourcep334

, e.g. because it is a simple movie file and the user agent and the server

support HTTP Range requests, then the attribute would return an object with one range, whose start is the time of the first frame (the

earliest possible positionp348

, typically zero), and whose end is the same as the time of the first frame plus thedurationp349

attribute's

value (which would equal the time of the last frame, and might be positive Infinity).

Note

The range might be continuously changing, e.g. if the user agent is buffering a sliding window on an infinite stream. This is the behaviour

seen with DVRs viewing live TV, for instance.

Note

For instance, consider a large video file served on an HTTP server without support for HTTP Range requests. A browsercould

implement this by only buffering the current frame and data obtained for subsequent frames, never allow seeking, except for seeking to

the very start by restarting the playback. However, this would be a poor implementation. A high quality implementation would buffer the

last few minutes of content (or more, if sufficient storage space is available), allowing the user to jump back and rewatch something

surprising without any latency, and would in addition allow arbitrary seeking by reloading the file from the start if necessary, which would

be slower but still more convenient than having to literally restart the video and watch it all the way through just to get to an earlier

unbuffered spot.

Example

media.audioTracksp359

Returns anAudioTrackListp359

object representing the audio tracks available in themedia resourcep334

media.videoTracksp359

Returns aVideoTrackListp360

object representing the video tracks available in themedia resourcep334

Note

There are only ever oneAudioTrackListp359

object and oneVideoTrackListp360

object permedia elementp333

, even if anothermedia

resourcep334

is loaded into the element: the objects are reused. (TheAudioTrackp360

andVideoTrackp360

objects are not, though.)

Note

IDL

Support:

Chrome

None

Chrome for Android

None

UC Browser for

Android

None

iOS Safari

7.0-7.1+

Firefox

None

10+

Opera Mini

None

Android Browser

None

Edge

12+

Safari

6.1+

Opera

None

IE Mobile

10+

Source:caniuse.com

⋰

359

attribute EventHandler

onchange

;

attribute EventHandler

onaddtrack

;

attribute EventHandler

onremovetrack

;

};

interface AudioTrack {

readonly attribute DOMString id

;

readonly attribute DOMString kind

;

readonly attribute DOMString label

;

readonly attribute DOMString language

;

attribute boolean n enabled

;

};

interface VideoTrackList : EventTarget

{

readonly attribute unsigned long g length

;

getter VideoTrack

(unsigned long index);

VideoTrack

? getTrackById

(DOMString id);

readonly attribute long selectedIndex

;

attribute EventHandler

onchange

;

attribute EventHandler

onaddtrack

;

attribute EventHandler

onremovetrack

;

};

interface VideoTrack {

readonly attribute DOMString id

;

readonly attribute DOMString kind

;

readonly attribute DOMString label

;

readonly attribute DOMString language

;

attribute boolean n selected

;

};

media.audioTracksp359 .lengthp361

media.videoTracksp359 .lengthp361

Returns the number of tracks in the list.

audioTrack=media.audioTracksp359[index]

videoTrack=media.videoTracksp359[index]

Returns the specifiedAudioTrackp360

orVideoTrackp360

object.

audioTrack=media.audioTracksp359 .getTrackByIdp361(id)

videoTrack=media.videoTracksp359 .getTrackByIdp361(id)

Returns theAudioTrackp360

orVideoTrackp360

object with the given identifier, or null if no track has that identifier.

audioTrack.idp362

videoTrack.idp362

Returns the ID of the given track. This is the ID that can be used with afragment

if the format supportsmedia fragment syntax

, and that

can be used with thegetTrackById()method.

audioTrack.kindp362

videoTrack.kindp362

Returns the category the given track falls into. Thepossible track categoriesp362

are given below.

Note

360

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