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Since LimeSurvey 2.50, the theme engine use Bootstrap 3 as CSS framework. Bootstrap 3 being a standard framework, developers will find a lot of documentation, tutorials and forum threads about it on Internet.
Since LimeSurvey 3, the theme engine use Twig, so the theme developers can change the logic of the survey rendering in a safe and easy way. Twig replace the old system of replacement keywords that was used in the previous versions. The logic that was used to generate the HTML of the keywords are now available inside the theme's views.