Difference between Async and defer in javascript ||||
With HTML5, we get two new boolean attributes for the script tag: async and defer. Async allows execution of scripts asynchronously and defer allows execution only after the whole document has been parsed.
These two attributes are a must for increasing the speed and performance of websites. They allow the elimination of render-blocking JavaScript where the page would have to load and execute scripts before finishing to render the page. Here’s a usage example:
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