html - Last margin / padding collapsing in flexbox -


i have list of items i'm trying arrange scrollable horizontal layout flexbox.

each item in container has margin left , right, right margin of last item being collapsed.

is there way stop happening, or workaround?

codepen of issue: http://codepen.io/anon/pen/wxmdpn

ul {    list-style-type: none;    padding: 0;    margin: 0;    display: flex;    height: 300px;    overflow: auto;    width: 600px;    background: orange;  }  ul li {    background: blue;    color: #fff;    padding: 90px;    margin: 0 30px;    white-space: nowrap;    flex-basis: auto;  }
<div class"container">    <ul>      <li>item 1</li>      <li>item 2</li>      <li>item 3</li>      <li>item 4</li>    </ul>  </div>

this appears default behavior on major browsers: in testing, right margin collapses in firefox, chrome, safari, ie11 , edge.

without going great deal of experimentation, i'll suggest behavior defined in spec:

10.3.3 block-level, non-replaced elements in normal flow

the following constraints must hold among used values of other properties:

margin-left + border-left-width + padding-left + width + padding-right + border-right-width + margin-right = width of containing block

if width not auto , border-left-width + padding-left + width + padding-right + border-right-width (plus of margin-left or margin-right not auto) larger width of containing block, auto values margin-left or margin-right are, following rules, treated zero.

if of above have computed value other auto, values said "over-constrained" , 1 of used values have different computed value. if direction property of containing block has value ltr, specified value of margin-right ignored , value calculated make equality true. if value of direction rtl, happens margin-left instead

(emphasis added)

so, according css visual formatting model, containing block may "over-constrained" and, result, right margin gets tossed out.

one solution add right border last element:

li:last-child {   border-right: 30px solid orange; } 

ul {    list-style-type: none;    padding: 0;    margin: 0;    display: flex;    height: 300px;    overflow: auto;    width: 600px;    background: orange;  }  ul li {    background: blue;    color: #fff;    padding: 90px;    margin: 0 30px;    white-space: nowrap;    flex-basis: auto;  }  li:last-child {    border-right: 30px solid orange;  }
<ul>    <li>item 1</li>    <li>item 2</li>    <li>item 3</li>    <li>item 4</li>  </ul>

another solution uses pseudo-elements instead of margins (or padding).

pseudo-elements on flex container rendered flex items. first item in container ::before , last item ::after.

ul::after {   content: "";   flex: 0 0 30px; } 

ul {    list-style-type: none;    padding: 0;    margin: 0;    display: flex;    height: 300px;    overflow: auto;    width: 600px;    background: orange;  }  ul li {    margin: 0 30px;    background: blue;    color: #fff;    padding: 90px;    white-space: nowrap;    flex-basis: auto;  }  ul::after {    content: "";    flex: 0 0 30px;  }    ul::before {    content: "";    flex: 0 0 30px;  }
<ul>    <li>item 1</li>    <li>item 2</li>    <li>item 3</li>    <li>item 4</li>  </ul>


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