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Converting A Previous Joomla! Version Template

From Joomla! Documentation

This can be further simplified to two lines of code:

JHtmlBootstrap::loadCss($includeMaincss = true, $this->direction);

JHtml::_('bootstrap.framework');

The first line loads cor CSS whereas the second loads core JavaScript. I'd recommend this route for anyone not using LESS in Joomla 3.