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CSP: style-src-elem

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.

Syntax

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>;

Sources

<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).

Examples

TBD

Specifications

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
style-src-elem
75
79
No
No
62
preview
75
75
No
No
No
11.0

See also

© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem