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 ES2015 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.