CSP: style-src-elem

The HTTP Content-Security-Policy (CSP) style-src-elem directive specifies valid sources for stylesheets <style> elements and <link> elements with rel="stylesheet".

CSP version 3
Directive type Fetch directive
default-src fallback

Yes. If this directive is absent, the user agent will look for the style-src directive, and if both of them are absent, fallback to default-src directive.


One or more sources can be allowed for the style-src-elem policy:

Content-Security-Policy: style-src-elem <source>;
Content-Security-Policy: style-src-elem <source> <source>;

style-src-elem can be used in conjunction with style-src:

Content-Security-Policy: style-src <source>;
Content-Security-Policy: style-src-elem <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).




Content Security Policy Level 3
# directive-style-src-elem

Browser compatibility

BCD tables only load in the browser

See also