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No space is allowed. The type represents the category and can be a discrete or a multipart type. The subtype is specific to each type. Multipart types indicate a category of document that are broken in distinct parts, often with different MIME types.
It is a way to represent a composite document. This is the default value for a binary file. As it really means unknown binary file, browsers usually don't automatically execute it, or even ask if it should be executed. They treat it as if the Content-Disposition header was set with the value attachment and propose a 'Save As' file. This is the default value for textual files. Even if it really means unknown textual file, browsers assume they can display it. If they expect a specific kind of textual data, they will likely not consider it a match.
Possible uses for this element include defining a relational framework for navigation. This element is most used to link to style sheets. Special attention has to be paid to serve CSS files with the correct type.
All HTML content should be served with this type. Only a handful of image types are widely recognized and are considered Web safe, ready for use in a Web page:. Other kinds of images can be found in Web documents. For example, many browsers support icon image types for favicons or similar. Like images, HTML doesn't define a set of supported types to use with the element is used to embed sound content in documents.
It can also be the destination for streamed media, using a MediaStream. The Media formats supported by the HTML audio and video elements explains both the codecs and container formats which can be used. The MIME type of such files mostly represent the container formats and the most common ones in a Web context are:.
An audio or video file using the OGG container format. Theora is the usual video codec used within it; Vorbis is the usual audio codec. As a multipart document format, it consists of different parts, delimited by a boundary a string starting with a double dash '--'. Each part is an entity by itself, with its own HTTP headers, Content-Disposition , and Content-Type for file uploading fields, and the most common Content-Length is ignored as the boundary line is used as the delimiter.
When the Partial Content status code is sent, this MIME type is used to indicate that the document is composed of several parts, one for each of the requested range. Like other multipart types, the Content-Type uses the boundary directive to define the boundary string. Each of the different parts have a Content-Type header with the actual type of the document and a Content-Range with the range they represent.
For security reasons, most browsers do not allow setting a custom default action for such resources, forcing the user to store it to disk to use it. Some commonly seen incorrect server configurations happen with the following file types:. In this case, the ideal would be to set the true type of the encoded files; this is often not possible as it may not be known to the server and these files may contain several resources of different types.
Audio and video files. Only resources with the correct MIME Type will be recognized and played in embeds a media player which supports video playback into the document. Be sure to use the correct type for audio and video. Pay particular attention when serving a proprietary file type. Each browser performs this differently and under different circumstances. There are some security concerns with this practice, as some MIME types represent executable content and others not.
Represents any kind of images. Videos are not included, though animated images like animated gif are described with an image type.
An audio file in the WAVE container format. A video file, possibly with audio, in the WebM container format. VP8 and VP9 are the most common video codecs used within it; Vorbis and Opus the most common audio codecs.
An audio file in the OGG container format. Vorbis is the most common audio codec used in such a container. A video file, possibly with audio, in the OGG container format.