それを自分で試してみてください - JavaScript Reference style

<!DOCTYPE html>
<html>
<head>
<style>
#main {
    width: 350px;
    height: 100px;
    border: 1px solid #c3c3c3;
    display: -webkit-flex; /* Safari */
    display: flex;
}

#main div {
    -webkit-flex-grow: 0; /* Safari 6.1+ */
    -webkit-flex-shrink: 0; /* Safari 6.1+ */
    -webkit-flex-basis: 40px; /* Safari 6.1+ */
    flex-grow: 0;
    flex-shrink: 0;
    flex-basis: 40px;
}
</style>
</head>
<body>

<p>Click the "Try it" button to set the value of the flexBasis property to "200px" for the blue div element</p>

<p><b>Note:</b> Internet Explorer 10 and earlier versions earlier versions do not support the flexBasis property.</p>

<p><b>Note:</b> Safari 6.1 (and newer) supports an alternative, the WebkitFlexBasis property.</p>

</body>
</html>