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. render: The rendering of content on the screen is blocked.The operations that are to be blocked must be a space-separated list of blocking attributes listed below. This attribute explicitly indicates that certain operations should be blocked on the fetching of the script. 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 fetched in parallel to parsing and evaluated as soon as they are available. This element includes the global attributes. Allowing cross-origin use of images and canvas.HTML table advanced features and accessibility. From object to iframe - other embedding technologies.Assessment: Structuring a page of content.
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