Element Description
<embed> The HTML <embed> Element represents an integration point for an external application or interactive content (in other words, a plug-in).
<object> The HTML Embedded Object Element (<object>) represents an external resource, which can be treated as an image, a nested browsing context, or a resource to be handled by a plugin.
<param> The HTML <param> Element (or HTML Parameter Element) defines parameters for <object>.
<source> The HTML <source> element specifies multiple media resources for either the <picture>, the <audio> or the <video> element. It is an empty element. It is commonly used to serve the same media content in multiple formats supported by different browsers.