It was not implemented in Chrome. There is a bug installed in RESOLVED FIXED, but there seems to be no information about the actual fix that was implemented. MDN info says there is support from Chrome 35, but links to this error.
In dev tools in Chrome 38, the declaration is strikethrough, but the tooltip text says that the property value is not valid. This is fixed in Chrome 40: the tooltip states that the property name is not valid (this means that the browser is not recognized / supported by the browser). Enabling the "Experimental Web Platform Features" does not seem to help. Thus, the property remains unrealized.
Edit: As already mentioned in the question, Chrome has supported this feature since version 47, and browser support is good (although not perfect), otherwise see http://caniuse.com/#feat=css-text-align- last
Jukka K. Korpela
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