confi-emacs-inicial/elpa/ac-html-20151005.731/completion-data/html-tag-short-docs/source

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The HTML <source> element is used to specify multiple media resources for <picture>, <audio> and <video> elements. It is an empty element. It is commonly used to serve the same media in multiple formats supported by different browsers.
Content categories:
None.
Permitted content:
None, it is an empty element.
Tag omission:
It must have start tag, but must not have an end tag.
Permitted parent elements:
A media element (<audio> or <video>, and it should be placed before any flow content or <track> element.
DOM interface:
HTMLSourceElement