https://github.com/XhmikosR/government.github.com/commit/3bd45ac7f745d9cdad1ffa163c7eac1871f7b56a which means it's removed in html5 boilerplate.

And the reason for this is because it's obsolete. More info  https://github.com/h5bp/html5-boilerplate/commit/8fc26501f4635df92bbbff966d8d6e6064e0e419.