html - Display a child to outside its offscreen parent until parent appears wide enough -

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let's have horizontally sliding menu toggles between being aligned to, , hidden beyond, left-hand side of browser window:

open (has class "open")     closed (class "open" removed) +------+--------------+     +---------------------+ |      |              |     |                     | |      |              |     |                     | |      |              |     |                     | |      |              |     |                     | |      |              |     |                     | +------+--------------+     +---------------------+

scss:

header nav[role="navigation"] {     background: $primary-colour;     bottom: 0;     left: -282px;     position: absolute;     top: 0;     width: 282px;     @include transition(left 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000));     &.open {         left: 0;     } }

now let's want toggle button either: 1) sits @ left of window while menu closed, , 2) sits inside menu, aligned right when open:

open                        closed +--+---+--------------+     +---+-----------------+ |  | x |              |     | = |                 | |  +---+              |     +---+                 | |      |              |     |                     | |      |              |     |                     | |      |              |     |                     | +------+--------------+     +---------------------+

in addition, should honour menu's transition, aligns right-hand side @ point @ menu's visible width matches width of button. there way achieve css alone?

with little css jiggling, came solution:

// js illustrate animation  $('.nav-toggle').click(function() {    $('.nav').toggleclass('open');  });
.window {    background: lightgrey;    display: block;    height: 200px;    margin: 0 0 10px;    overflow-x: hidden;    position: relative;    width: 400px;  }  .nav {    background: blue;    bottom: 0;    position: absolute;    top: 0;    width: 0;    -webkit-transition: width 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000);    -moz-transition: width 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000);    -ms-transition: width 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000);    -o-transition: width 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000);    transition: width 250ms cubic-bezier(0.645, 0.045, 0.355, 1.000);  }  .nav.open {    width: 80px;  }  .nav-toggle-wrapper {    height: 40px;    float: left;    min-width: 40px;    width: 100%;  }  .nav-toggle {    background: red;    height: 40px;    float: right;    width: 40px;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="window">    <div class="nav">      <div class="nav-toggle-wrapper">        <div class="nav-toggle"></div>      </div>    </div>  </div>

also, see example on jsfiddle > link


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