Unicode Bidirectional override fails for Input Placeholders.
对于输入占位符，Unicode双向失败，下面是带有html和CSS的MARKUP（具有rtl实现和unicode双向覆盖）并且输出相同。
<!DOCTYPE html>
<html>
<head>
<style>
* {
direction: rtl !important;
unicode-bidi: bidi-override !important;
}
</style>
</head>
<body>
<h1>The unicode-bidi Property</h1>
<div>Some text. Default writing direction.</div>
<div class="ex1">Some text. Right-to-left direction.</div>
<input placeholder="abc def"/>
</body>
</html>
The output with failing bidirectional for placeholder
https://www.w3schools.com/code/tryit.asp?filename=G37SI0TRBPPM
你需要添加占位符css：
这是更新的小提琴：
* {
direction: rtl;
unicode-bidi: bidi-override;
}
input[type="text"]:-moz-placeholder {
unicode-bidi: bidi-override;
}
input[type="text"]:-ms-input-placeholder {
unicode-bidi: bidi-override;
}
input[type="text"]::-webkit-input-placeholder {
unicode-bidi: bidi-override;
}<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div class="ex1">Some text. Right-to-left direction.</div>
<input type="text" placeholder="abc def" />
</body>
</html>