External Libraries and <script> in HTML file


I'm quite new to WebStorm and even quite unexperienced with JavaScript. Now, I want to start a bigger JavaScript project using WebStorm 6.
After my first attempt to walk with WebStorm 6, a question came up:

How can I reference an External Library in the <script> element of the HTML file ?

Is it right to reference an External Library from <script>? Or, do I have to copy the used external library into the project folder (i.e. to scripts/libs) additionally?
Is the only purpose of an External Library to enable code completion, quick fix ... in JavaScript files of the project?

I search the docs some hours but I found no clear answer for my questions :(

Can sombody pls clearify?



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