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What’s the difference between async vs defer attributes

According to https://caniuse.com/ website, async and defer attributes for the <script> element have great support and I think it might be a good time to learn what they do and how to use them.

JavaScript is considered a “parser blocking resource” causing blocking of HTML parsing. Thankfully, the latest technologies such as HTML5 gives you 3 ways to tell browser when to run JavaScript code.

<script>

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