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@supports not (display: flex) {
	section { float: left; }
}

section {
	float: left;
}

@supports (display: -webkit-flex) or
          (display: -moz-flex) or
          (display: flex) {

    section {
      display: -webkit-flex;
      display: -moz-flex;
    	display: flex;
    	float: none;
    }
}