In the thread, multiple people answered his question. Here are the two most significant reasons that I noticed.
1. The prefix was already not being supported by most browsers, thus supporting it would mean supporting the development of websites that don't work properly in other browsers.
2. Best practices suggest that one shouldn't rely solely on the prefixed version of an experimental alias. If this developer had written good code to start with, he wouldn't have had the problems he ran into.
1. The prefix was already not being supported by most browsers, thus supporting it would mean supporting the development of websites that don't work properly in other browsers.
2. Best practices suggest that one shouldn't rely solely on the prefixed version of an experimental alias. If this developer had written good code to start with, he wouldn't have had the problems he ran into.