[17] CSS Extensions for Multimodal Interaction ( ( 版)) http://www.w3.org/People/Raggett/css-mmi/#next
[18] CSS Extensions for Multimodal Interaction ( ( 版)) http://www.w3.org/People/Raggett/css-mmi/#state
[1] Custom State Pseudo Class () https://wicg.github.io/custom-state-pseudo-class/
[2] WICG/custom-state-pseudo-class () https://github.com/WICG/custom-state-pseudo-class