drag and drop, prevent awkward highlighting?

Question

I\'m building a drag and drop method, using query -onmousedown leading to -onmousemove (drag) then -onmouseup (unbinds onmousemove)

the problem is, browser defaults begi

Answer 1

add css

-webkit-touch-callout: none;/*for mobile*/
-webkit-user-select: none;/*for chrome*/
-khtml-user-select: none;/*for safari*/
-moz-user-select: none;/*for Mozilla*/
-ms-user-select: none;/*for mircosoft*/
-o-user-select: none;/*for opera*/
user-select: none;/*base css ,but not work in all browsers*/