Script Tag - async & defer

Question

I have a couple of questions about the attributes async & defer for the

Answer 1

async and defer will download the file during HTML parsing. Both will not interrupt the parser.

• The script with async attribute will be executed once it is downloaded. While the script with defer attribute will be executed after completing the DOM parsing.

• The scripts loaded with async does n't guarantee any order. While the scripts loaded with defer attribute maintains the order in which they appear on the DOM.

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