I categorize Tisa Web Pro as an “Other Serif” font, because it does not fall neatly into any of the general historic categories commonly used to describe serif type. According to Miklavčič, the intent was to “develop a softer, more dynamic version of a nineteenth-century slab serif wood type.”
Tisa’s almost-slab serifs are slightly tapered, its aperture is open and humanist, its bowls have an implied stress, its x-height is generous. The font gracefully mixes-and-matches various historic approaches to font design, resulting in a slightly “square” or “structured” feeling font with humanist qualities. The bold is acceptable, but slightly too heavy for my personal preference.
Tisa Web Pro works well cross browser. 4 styles are available via typekit. The full family (10 styles, including a medium weight which is slightly lighter than the bold) is available for licensing via fontshop.