CSP: script-src-attr

The HTTP Content-Security-Policy (CSP) script-src-attr directive specifies valid sources for JavaScript inline event handlers. This includes only inline script event handlers like onclick, but not URLs loaded directly into <script> elements.

CSP version 3
Directive type Fetch directive
default-src fallback Yes. If this directive is absent, the user agent will look for the script-src directive, and if both of them are absent, fallback to default-src directive.


One or more sources can be allowed for the script-src-attr policy:

Content-Security-Policy: script-src-attr <source>;
Content-Security-Policy: script-src-attr <source> <source>;

script-src-attr can be used in conjunction with script-src:

Content-Security-Policy: script-src <source>;
Content-Security-Policy: script-src-attr <source>;


<source> can be any one of the values listed in CSP Source Values.

Note that this same set of values can be used in all fetch directives (and a number of other directives).


Fallback to script-src

If script-src-attr is absent, User Agent falls back to the script-src directive, and if that is absent as well, to default-src.


Content Security Policy Level 3
# directive-script-src-attr

Browser compatibility

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See also