Every javascript dev should know this defer attribute

the `defer` attribute in javascript is an essential tool for optimizing the loading of scripts in web development. when applied to script tags, it instructs the browser to download the script in parallel while continuing to parse the html document. this means that the script will only execute after the html is fully parsed, ensuring that the dom is ready for manipulation. this is particularly beneficial for improving page load performance and user experience, as it prevents scripts from blocking the rendering of the page. the `defer` attribute works only with external scripts and maintains the order of execution, which is crucial when multiple scripts depend on each other. using `defer` can help avoid issues related to the timing of script execution, making it a best practice for modern javascript development. familiarity with this attribute allows developers to write more efficient, performant web applications.
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