Suppressing the 300ms click delay - QuirksBlog

By default, if you tap on a touchscreen it takes about 300ms before a click event fires. It’s possible to remove this delay, but it’s complicated. I investigated it. The reason for the delay is double-tap. Once your finger releases the screen, the OS and browser cannot be sure yet if you’re done with your touch action, or if a second tap will follow, which would make the action a double tap (which

[ama-ch]

Nexus7だとwidth=device-widthの遅延無効化が効いたり効かなかったりするらしい。