Implement `safe` and `unsafe` overflow-position alignment keywords (#952)
1<!DOCTYPE html>
2<html lang="en">
3<head>
4 <script src="../../scripts/gentest/test_helper.js"></script>
5 <link rel="stylesheet" type="text/css" href="../../scripts/gentest/test_base_style.css">
6 <title>
7 Test description
8 </title>
9</head>
10<body>
11
12<div id="test-root" style="display: flex; width: 100px; height: 100px;">
13 <div style="width: 50px; height: 150px; flex-shrink: 0; align-self: unsafe end;"></div>
14</div>
15
16</body>
17</html>