If you want to use Bootstrap on your pen, go to the external stylesheets of the CSS section, type “Bootstrap”, select the option you want to use and include as many sources as you need ! It truly is very simple to set up a pen.
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It does not have intelliSense for auto-code completion . It is offline and does not have a cloud storage.
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CodePen supports Emmet. In HTML, try typing header. main-header>nav>ul. site-nav>li*6>a then pressing TAB .
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