audio

4. 4.8.11.11.4 Guidelines for exposing cues in various formats as text track cues If the element has a src attribute: zero or more track elements, then transparent , but with no media element descendants. If the element does not have a src attribute: zero or more source elements, then zero or more track elements, then transparent , but with no media element descendants. A video element is used for playing videos or movies, and audio files with captions. Content may be provided inside the video element. User agents should not show this content to the user; it is intended for older web browsers which do not support video , so that text can be shown to the users of these older browsers informing them of how to access the video contents. In particular, this content is not intended to address accessibility concerns. To make video content accessible to the partially sighted, the blind, the hard-of-hearing, the deaf, and those with other physical or cognitive disabilities, a variety of features are available. Captions can be provided, either embedded in the video stream or as external files using the track element. Sign-language tracks can be embedded in the video stream. Audio descriptions can be embedded in the video stream or in text form using a WebVTT file referenced using the track element and synthesized into speech by the user agent. WebVTT can also be used to provide chapter titles. For users who would rather not use a media element at all, transcripts or other textual alternatives can be provided by simply linking to them in the prose near the video element. [[WEBVTT]]( The video element is a media element whose media data is ostensibly video data, possibly with associated audio data. The video element has an internal shadow tree with no slot elements. The poster attribute gives the URL of an image file that the user agent can show while no video data is available. The attribute, if present, must contain a valid non-empty URL potentially surrounded by spaces . 1. Set the video element's poster lazy load resumption steps to null. 6. If the will lazy load element steps given the video return true: 1. Let posterResumptionSteps be the rest of this algorithm starting with the step labeled Fetch . 2. Set the video element's poster lazy load resumption steps to posterResumptionSteps. 7. Fetch request. This must delay the load event of the element's node document . The absence of the playsinline attribute does not imply that the video will display fullscreen by default. Indeed, most user agents have chosen to play all videos inline by default, and in such user agents the playsinline attribute has no effect. If the poster attribute is present and the loading attribute is in the Lazy state, the user agent must defer loading the poster image source data until the element's lazy load resumption steps are invoked. The video and poster image load eagerly and delay the window's load event. The video loads when layout is known, due to being in the viewport, however it does not delay the window's load event. The video loads and autoplay playback begins when layout is known, due to being in the viewport, however it does not delay the window's load event. The video loads only once scrolled into the viewport, and does not delay the window's load event. The video loads and autoplay playback begins only once scrolled into the viewport, and does not delay the window's load event. The video and poster image load only once scrolled into the viewport, and does not delay the window's load event. The video does not load until played. The poster image loads only once scrolled into the viewport, and does not delay the window's load event. The video's metadata loads only once scrolled into the viewport, and does not delay the window's load event. The video does not load until played. The poster image loads eagerly and delays the window's load event. The video element represents its poster frame , if any, or else the first frame o