转换：translateY(-50%) 在 Safari 中不起作用

Question

在 Chrome 中，我的代码工作正常，并且问题完全垂直居中，但在 Safari 中并非如此。这是我的一些代码。

@charset "UTF-8";
/* CSS Document */

body {
 font-family: "Poiret One"
}

.myelement {
 top: 50%;

 -ms-transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    transform: translateY(-50%);
 opacity: .80;
 width: 30%;
 height: auto;
 z-index: 100;
 position: relative;
}

.fullscreen-bg {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: hidden;
 z-index: -100;
}

*, *:before, *:after {
-moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
}

.cover-thing {
    width: 100%;
    height: 100%;
   text-align: center;
   top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

<!DOCTYPE html>
<html lang="en">

<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>something.com</title>

    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- Bootstrap Core JavaScript >
    <script src="js/bootstrap.min.js"></script-->
    
    <!--Custom JavaScript-->
    <script src="js/mjberger.js"></script>
    <!--JQuery-->
    <script src="js/jquery.min.js"></script>
    <!--<script>window.jQuery || document.write('<script src="js/jquery.min.js"><\/script>')</script>-->
    
    <!--<script type="text/javascript" src="js/jkit/jquery-1.9.1.min.js"></script>-->
 <script type="text/javascript" src="js/jkit/jquery.jkit.1.2.16.min.js"></script>
  

 
    <!---->
    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
        <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->
<link href="https://fonts.googleapis.com/css?family=Poiret+One|Inknut+Antiqua" rel="stylesheet">
<link rel="icon" href="mtab.png">

</head>
<body>

<section id="myDiv" class="cover-thing first" style="overflow: hidden;">

<div class="fullscreen-bg" style="z-index: 100; position: absolute; padding: 0px; justify-content:center;">
 <img src="https://www.codeproject.com/KB/GDI-plus/ImageProcessing2/flip.jpg" class="myelement"></img>
</div>

</section>

<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>

如您所见，它完美居中，但在 Safari 中并非如此，图像出现在屏幕顶部，只能看到一半。我尝试使用 -webkit- 但这也不起作用。我认为问题主要出在 transform: translateY(-50%);.

Answer 1

"negative translate" 技巧适用于绝对定位元素。使用 position: absolute 后，您可以使用相同的 transform.

将 x 轴和 y 轴居中

像这样更改 .myelement 样式以解决问题：

.myelement {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  opacity: .80;
  width: 30%;
  z-index: 100;
}

转换：translateY(-50%) 在 Safari 中不起作用

transform: translateY(-50%) not working in Safari

css

safari

transform

translate

centering