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I'm trying to test some HTML code including bootstrap in jsfiddle, but when including external css references, get this error:<br />
<br />
For external CSS files use the Resources panel on the left.<br />
<br />
How should I call external css references or external javascripts ?<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/08_w35/932298/bootstrap-on-jsfiddle.png" target="_blank" title="bootstrap-on-jsfiddle.png (51 KB)"><img alt="bootstrap-on-jsfiddle.png" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2015/08_w35/800_932298/bootstrap-on-jsfiddle.png" /></a>
</div>
</div>


bootstrap-on-jsfiddle.png

I'm trying to test some HTML code including bootstrap in jsfiddle, but when including external css references, get this error:

For external CSS files use the Resources panel on the left.

How should I call external css references or external javascripts ?



Bootstrap on jsfiddle

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Bootstrap is a free and open-source collection of tools for creating websites and web applications. It contains HTML- and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions. It aims to ease the development of dynamic websites and web applications. Bootstrap is a front end web framework, that is, an interface for the user, unlike the server-side code which resides on the "back end" or server.