I'm bewildered by the many "under consideration" entries. When all the other major players support something, and you want to be taken seriously, why aren't you throwing more engineers at the problem?
That said, despite Google's leadership in this area, Chrome's support of "new browser features" is often sloppy. They ship some features in quite broken states, and don't get around to fixing them until a lot later. The Chromium issue tracker has over 56,000 open issues. Google are going for quantity over quality when it comes to new features.