Applies to audio files like MP3, WAV, or OGG.
Applies to HTML documents.
Applies to fetch and XHR requests on a document.
Applies to resources which are fonts.
Applies to resources which are images.
Applies to navigate requests on a document.
Applies to resources which are PDF files.
Applies to resources which are JavaScript files.
Applies to resources which are style sheets.
Applies to resources which are subtitle tracks of the WebVTT format.
Applies to everything else.
Applies to resources which are videos.
An enumeration classifying the content of a request.