iPhoneX 安全区域 safe-area-inset-*样式不生效
解决办法： 添加 meta name="viewport" 中增加viewport-fit=cover内容
<meta name="viewport" id="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, viewport-fit=cover">
补充 1 兼容写法
iOS 11
constant(safe-area-inset-top)
iOS 11.2+env(safe-area-inset-top)
补充2 安卓
left: .6rem;
left: calc(env(safe-area-inset-left) + .6rem);
left: calc(constant(safe-area-inset-left) + .6rem);