修改默认字体颜色(style)：
input::placeholder{
color: green;
}
<input type="search" name="se" placeholder="默认值 输入内容则不显示" autofocus="autofocus"><input type="search" name="se" placeholder="默认值 输入内容则不显示" autofocus="autofocus" autocomplete="off"> <br />选择多个文件：<br /> <input type="file" multiple="multiple"> <br />
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