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Difference between <script>, <script async> & <script defer>.

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Difference between <script>, <script async> & <script defer>.
posted Jan 22, 2015 by Vrije Mani Upadhyay

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HTML5: async, defer

In HTML5, you can tell browser when to run your JavaScript code. There are 3 possibilities:

<script       src="myscript.js"></script>

<script async src="myscript.js"></script>

<script defer src="myscript.js"></script>

① Without “async” or “defer”, browser will run your script immediately, before rendering the elements that's below your script tag.

② With “async” (asynchronous), browser will continue to load the HTML page and render it while the browser load and execute the script at the same time.

③ With “defer”, browser will run your script when the page finished parsing. (not necessary finishing downloading all image files. This is good.)

answer Feb 12, 2015 by Rahul Singh
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