If a higher-level policy is not available, the empty string is treated as being equivalent to strict-origin-when-cross-origin. If referrerpolicy is not explicitly specified on the element, it will adopt a higher-level referrer policy, i.e. Note: An empty string value ( "") is both the default value, and a fallback value if referrerpolicy is not supported. This value is unsafe, because it leaks origins and paths from TLS-protected resources to insecure origins.
unsafe-url: The referrer will include the origin and the path (but not the fragment, password, or username).
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strict-origin-when-cross-origin (default): Send a full URL when performing a same-origin request, only send the origin when the protocol security level stays the same (HTTPS→HTTPS), and send no header to a less secure destination (HTTPS→HTTP).
strict-origin: Only send the origin of the document as the referrer when the protocol security level stays the same (HTTPS→HTTPS), but don't send it to a less secure destination (HTTPS→HTTP).same-origin: A referrer will be sent for same origin, but cross-origin requests will contain no referrer information.Navigations on the same origin will still include the path. origin-when-cross-origin: The referrer sent to other origins will be limited to the scheme, the host, and the port.origin: The sent referrer will be limited to the origin of the referring page: its scheme, host, and port.no-referrer-when-downgrade: The Referer header will not be sent to origins without TLS ( HTTPS).no-referrer: The Referer header will not be sent.Indicates which referrer to send when fetching the script, or resources fetched by the script: It is critical to provide a nonce that cannot be guessed as bypassing a resource's policy is otherwise trivial. The server must generate a unique nonce value each time it transmits a policy. nonceĪ cryptographic nonce (number used once) to allow scripts in a script-src Content-Security-Policy. This Boolean attribute is set to indicate that the script should not be executed in browsers that support ES modules - in effect, this can be used to serve fallback scripts to older browsers that do not support modular JavaScript code.
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This attribute contains inline metadata that a user agent can use to verify that a fetched resource has been delivered free of unexpected manipulation. autoĭefault: Signals automatic determination of fetch priority relative to other external scripts. Signals a low-priority fetch relative to other external scripts. Signals a high-priority fetch relative to other external scripts. Provides a hint of the relative priority to use when fetching an external script. This attribute allows the elimination of parser-blocking JavaScript where the browser would have to load and evaluate scripts before continuing to parse. Scripts with the defer attribute will execute in the order in which they appear in the document.
The defer attribute has no effect on module scripts - they defer by default. for inline scripts), in this case it would have no effect. Warning: This attribute must not be used if the src attribute is absent (i.e. Scripts with the defer attribute will prevent the DOMContentLoaded event from firing until the script has loaded and finished evaluating. This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed, but before firing DOMContentLoaded. See CORS settings attributes for a more descriptive explanation of its valid arguments. To allow error logging for sites which use a separate domain for static media, use this attribute. Normal script elements pass minimal information to the window.onerror for scripts which do not pass the standard CORS checks. See Browser compatibility for notes on browser support. This is a boolean attribute: the presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value. asyncįor classic scripts, if the async attribute is present, then the classic script will be fetched in parallel to parsing and evaluated as soon as it is available.įor module scripts, if the async attribute is present then the scripts and all their dependencies will be executed in the defer queue, therefore they will get fetched in parallel to parsing and evaluated as soon as they are available. This element includes the global attributes.
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