The tag defines a container for external (non-HTML) content. (It is an HTML5 tag, invalid in HTML 4, but works in all browsers). The following code fragment can display an MP3 file embedded in a web page: Example The tag is invalid in HTML 4. Your page will not validate as HTML 4. Different browsers have different audio format support. If a browser does not support the file format, the audio will not play without a plug-in. If the plug-in is not installed on the users' computer, the audio will not play. If you convert the file to another formats, it will still not play in all browsers. NOTE: Using (HTML5) solves the validation problem. Using The Element The tag can also define a container for external (non-HTML) content. The following code fragment can display an MP3 file embedded in a web page. Example Different browsers have different audio format support. If a browser does not support the file format, the audio will not play without a plug-in. If the plug-in is not installed on the users' computer, the audio will not play. If you convert the file to another formats, it will still not play in all browsers.