Describe the role of deferred scripts in javascript.
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The defer Attribute:
The defer attribute tells the browser to continue to process the HTML and build DOM and does not wait till the script file is executed fully. The script loads “in the background”, and then runs later when the DOM is completely built.
For example:
The script is loaded asynchronously, the script file can be downloaded while the HTML document is still parsing, even if the file is fully downloaded before the HTML document is finished parsing, the script is not executed until the parsing is complete. Hence, scripts with a defer attribute will never block the page and always execute when the DOM is completely ready.