1，测试代码如下：
<html lang="en">
<head>
<meta charset="UTF-8">
<title>新建标签页</title>
<link href="css/chunk-vendors.c98dfc91.css" rel="stylesheet">
<link href="css/browser.6f94aa46.css" rel="stylesheet">
</head>
<body onselectstart="return false;">
<div data-v-615293b9="" class="browserVue">
<div data-v-615293b9="" class="addressSty">
<div data-v-615293b9="" class="addressCenter">
<div data-v-615293b9="" class="inputBox">
<input data-v-615293b9="" placeholder="搜索或输入Web地址" size="small" maxlength="1000" spellcheck="false">
</div>
</div>
</div>
</div>
</body>
</html>body,html {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow-x: hidden
}
.browserVue .addressSty[data-v-615293b9] {
width: 100%;
height: 50px;
/*line-height: 31px;*/
padding: 3px 0;
box-sizing: border-box;
border-bottom: 1px solid #ccc
}
.browserVue .addressSty .addressCenter .inputBox[data-v-615293b9] {
width: 100%;
height: 30px;
}
/*!!!!!!!!!!!!!!!!!!!*/
.browserVue .addressSty .addressCenter .inputBox input[data-v-615293b9] {
width: 300px;
height: 100%;
border: 0;
outline: none;
display: block;
background: #f1f3f4;
overflow: hidden; /*!!!!!!!!!!!!!!!!!!!*/
}
input {
/*line-height: inherit*/
line-height: 41px;
}
发现mb57版本是好的。对比了一下流程，发现mb57在LayoutTextControlSingleLine::createInnerEditorStyle这多了textBlockStyle->setLineHeight的第二次设置。另外默认的html.css也多了句input::-webkit-input-placeholder的line-height: initial;设置。