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

Question

i want to create a chrome extension. its have complex mathematical queries. so i need to use python as scripting language. help me to implement python script in google chrome addon

Answer 1

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.)