Initiator Type Destination granular Initiator? CSP directive Features
"" "" "" "" ? CSP, NEL reports.
"document" HTML's navigate algorithm.
"subresource" "" connect-src navigator.sendBeacon(), EventSource, HTML's ping=""
"unknown" object object-src HTML's <object>
"unknown" embed object-src HTML's <embed>
"audio" "subresource" audio media-src HTML's <audio>
"font" "subresource" font font-src CSS' @font-face
"image" "subresource" image img-src HTML's <img src>, /favicon.ico resource, SVG's <image>, CSS' background-image, CSS' cursor, CSS' list-style-image, …
"script" "subresource" script script-src HTML's <script>, importScripts()
"serviceworker" script ? navigator.serviceWorker.register()
"sharedworker" script child-src SharedWorker
"script" script child-src Worker
"style" "subresource" style style-src HTML's <link rel=stylesheet>, CSS' @import
"track" "subresource" track media-src HTML's <track>
"video" "subresource" video media-src HTML's <video> element
"download" "" "" download ? HTML's download="", "Save Link As…" UI
"fetch" "" "subresource" fetch connect-src fetch(), Cache API?, XMLHttpRequest
"imageset" "image" "subresource" image img-src HTML's <img srcset> and <picture>
"manifest" "" "subresource" manifest manifest-src HTML's <link rel=manifest>
"xslt" "script" "subresource" script script-src <?xml-stylesheet>
? "?" "?" ? child-src HTML's <iframe>, <frame>