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flex引起height:100%失效

<!DOCTYPE html><html><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title></title>    <meta charset="utf-8" />    <style>        * {            margin: 0;            padding: 0;            box-sizing: border-box;        }        html, body {            height: 100%;        }        .wrap {            display: flex;            flex-direction: column;            height: 100%;        }        header {            height: 50px;            line-height: 50px;            text-align: center;            background-color: #ccc;            border-bottom: 1px solid #999;        }        footer {            height: 50px;            line-height: 50px;            text-align: center;            background-color: #ccc;            border-top: 1px solid #999;        }        .main {            flex: 1;            position: relative;        }        .panel {            position: absolute;            width: 100%;            height: 100%;            background-color: #ccc;        }    </style></head><body>    <div class="wrap">        <header>            头部        </header>        <div class="main">            <div class="panel">                <pre>                    父容器position:relative;                    子元素position:absolute;                    width: 100%;                    height:100%;                </pre>            </div>        </div>        <footer>            底部        </footer>    </div></body></html>

flex引起height:100%失效