flexbox in IE (10+ and 9 and 8)
.parent {
display: -webkit-box !important;
display: -moz-box !important;
display: -ms-flexbox !important; /* works in IE10+, `flex` works in IE10+ */
display: -o-box !important;
display: flex !important; /* works in IE10+ */
display: table; /* works in IE9 */
}
.child1 {
-moz-box-flex: 5;
-webkit-box-flex: 3;
35%;
-ms-flex: 3;
flex:3; /* works in IE10+ */
display: table-cell; /* works in IE9 */
}