multiline-flexbox in IE11 calculating widths incorrectly?

Question

Seems IE11 doesn\'t calculate flex item widths properly if flex-wrap: wrap is used.

See http://jsfiddle.net/MartijnR/WRn9r/6/

The 4 boxes each h

Answer 1

I received an workaround on the Microsoft forum from Rob. See http://social.msdn.microsoft.com/Forums/ie/en-US/8145c1e8-6e51-4213-ace2-2cfa43b1c018/ie-11-flexbox-with-flexwrap-wrap-doesnt-seem-to-calculate-widths-correctly-boxsizing-ignored?forum=iewebdevelopment

Setting a min-width and changing to flex:auto makes the boxes behave, maintaining their flexiness.

See http://jsfiddle.net/MartijnR/WRn9r/23/ and below for a slightly more advanced example with the workaround:

    
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section {
    display: -moz-webkit-flex;
    display: -webkit-flex;
    display: flex;
    -ms-flex-direction: row;
    -moz-flex-direction: row;
    -webkit-flex-direction: row;
    flex-direction: row;
    -ms-flex-wrap: wrap;
    -moz-flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    width: 100%;
    box-sizing:border-box;
    margin:0;
}
.box {
    border: 1px solid black;
    background: #ccc;
    display: block;
    box-sizing: border-box;
    margin:0;
    -ms-flex: auto;
    -moz-flex: auto;
    -webkit-flex: auto;
    flex: auto;
}
.fifty {
    min-width: 50%;
}
.twentyfive {
    min-width: 25%;
}