html - why margin-right: auto has effect on justify-content? -


this question has answer here:

the following using bootstrap code version 4.

<div class="collapse navbar-collapse" id="navbarsupportedcontent">         <ul class="navbar-nav mr-auto">             <li class="nav-item active">                 <a class="nav-link" href="/">dashboard <span class="sr-only">(current)</span></a>             </li>             <li class="nav-item">                 <a class="nav-link" href="/requests/get">file request</a>             </li>             <li class="nav-item">                 <a class="nav-link" href="/requests/send">send files</a>             </li>             <li class="nav-item">                 <a class="nav-link" href="/history">history</a>             </li>             <li class="nav-item">                 <a class="nav-link" href="/users">user management</a>             </li>         </ul>     </div>  .navbar-toggleable-md .navbar-collapse {     display: -webkit-box !important;     display: -ms-flexbox !important;     display: flex !important;     width: 100%;     justify-content: flex-end; }  .navbar-toggleable-md .navbar-nav {     -webkit-box-orient: horizontal;     -webkit-box-direction: normal;     -ms-flex-direction: row;     flex-direction: row; }  .mr-auto {     margin-right: auto !important; }

i wanted move ul right, set justify-content: flex-end on .navbar-collapse. didn't work @ first until removed .mr-auto.

i wondering why margin-right: auto have effect on justify-content?


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