disable Bootstrap's Collapse open/close animation [duplicate]

Question

Any trick to disable the open/close animation of Collapse groups ?

Answer 1

For Bootstrap 3 and 4 it's

.collapsing {     -webkit-transition: none;     transition: none;     display: none; } 

Answer 2

Bootstrap 2 CSS solution:

.collapse {  transition: height 0.01s; }   

NB: setting transition: none disables the collapse functionnality.

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Bootstrap 4 solution:

.collapsing {   transition: none !important; }