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The HTML specification does not specify which video and audio formats browsers should support. User agents are free to support any video formats they feel are appropriate, but content authors cannot assume that any video will be accessible by all complying user agents, since user agents have no minimal set of video and audio formats to support.
The W3C's web content accessibility guidelines state that the alt attribute is used to convey the meaning and intent of the image, rather than being a literal description of the image itself. [9] For example, an alt attribute for an image of an institution's logo should convey that it is the institution's logo rather than describing details of ...
In the case of an image, the file description page shows a higher resolution version of the image, if available. To view the file description page for an image or video, click on the image itself. For a sound file, click on the information icon, , near the sound clip link. A file description page consists of five parts:
A video file format is a type of file format for storing digital video data on a computer system. Video is almost always stored using lossy compression to reduce the file size. A video file normally consists of a container (e.g. in the Matroska format) containing visual (video without audio) data in a video coding format (e.g. VP9 ) alongside ...
WebM is an audiovisual media file format. [5] It is primarily intended to offer a royalty-free alternative to use in the HTML video and the HTML audio elements. It has a sister project, WebP, for images. The development of the format is sponsored by Google, and the corresponding software is distributed under a BSD license.
The image syntax begins with [[, contains components separated by |, and ends with ]].The [[and the first | (or, if there is no |, the terminating ]]) must be on the same line; other spaces and line breaks <br> (or <br />) are ignored if they are next to | characters or just inside the brackets.
When the image is a link, screen readers will read out the link filename (e.g., "slash green underscore tick") if the HTML alt attribute is empty or missing. Nearly all images in Wikipedia articles are links to the image description page, which contains a larger size version of the image, as well as licensing and attribution information. [Note 1]
VP8 is a traditional block-based transform coding format. It has much in common with H.264, e.g. some prediction modes. [8] At the time of first presentation of VP8, according to On2 the in-loop filter [9] and the Golden Frames [10] were among the novelties of this iteration.