CSP fetch directives are used in a Content-Security-Policy header and control locations from which certain resource types may be loaded. For instance, script-src allows developers to allow trusted sources of script to execute on a page, while font-src controls the sources of web fonts.
All fetch directives fall back to default-src. That means, if a fetch directive is absent in the CSP header, the user agent will look for the default-src directive.
These CSP directives are fetch directives:
child-srcconnect-srcdefault-srcfont-srcframe-srcimg-srcmanifest-srcmedia-srcobject-srcscript-srcstyle-srcworker-src
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Content-Security-Policy- Other kinds of directives: