cssHolmes module for XOOPS CMS 2.5.10+
cssHolmes module for XOOPS CMS is a "CSS Markup Detective", with diagnostic CSS stylesheet that can highlight potentially invalid, inaccessible or erroneous HTML(5) markup by adding one class.
Tutorial: see GitBook. To contribute to the Tutorial, fork it on GitHub
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Current and upcoming "next generation" versions of XOOPS CMS are crafted on GitHub at: https://github.com/XOOPS