Currently just a few values for box alignments are supported, basically because of the flexbox support. Meanwhile the box alignments were put into their own spec and extended. Properties and values still requiring support are (according to http://css3test.com): - align-self: start, end, self-start, self-end, left, right, true, safe - align-items: auto, start, end, self-start, self-end, left, right, true, safe - align-content: auto, baseline, start, end, self-start, self-end, left, right - justify-self: auto, stretch, baseline, center, start, end, self-start, self-end, left, right, true, safe - justify-items: auto, stretch, baseline, center, start, end, self-start, self-end, left, right, true, safe, legacy - justify-content: auto, baseline, center, start, end, self-start, self-end, left, right This issue is for implementing these properties and values. (May be split into several smaller issues.) Sebastian

All of these properties and values are now implemented in the style system. Note also that 'true' was renamed to 'unsafe'.