We exclusively use HTML5 instead of XHTML (or even older) HTML-versions. We like the new unity that HTML5 offers and try to keep our code according to the conventions. HTML5 and CSS 3 are natural partners and so it may not be surprising, that we're also using CSS 3. In most projects though, we extend the (already ubiquitous) standard features of CSS 3 through the use of SCSS, which enables us to get better insights into the aggregated, effective rules that apply for specific elements.
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