user-focus-select-unknown

user-focus-select-unknown

[1] Web Controls 1.0 ( 版) <http://www.whatwg.org/specs/web-controls/current-work/#user-focus-select-unknown>

[2] Web Controls 1.0 ( ( 版)) <http://www.whatwg.org/specs/web-controls/current-work/#focus0>