Optimize Your Scripts in DHTML Using the DEFER Attribute
DEFER is a relatively obscure attribute of the SCRIPT element, but if you want to enhance performance when authoring scripts, you can use it to indicate to Internet Explorer 4 or later that the SCRIPT tag contains no immediately executing code that impacts the document before the load event fires. Combined with the SRC attribute, you can use the DEFER attribute on a SCRIPT tag to indicate to IE that the associated code should be downloaded in the background while the rest of the components of the page are downloaded and parsed.
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