css更改placeholder

1.加入！important

2.但是不建议使用https://developer.mozilla.org/en-US/docs/Web/CSS/::-webkit-input-placeholder

3.调试，在settings里面设置

 

    #field3::-moz-placeholder {
        /*font-style:italic !important;*/
        /*text-decoration:overline !important;*/
        /*letter-spacing:3px !important;*/
        color:red !important;
    }
    #field3::-webkit-input-placeholder {
        /*font-style:italic !important;*/
        /*text-decoration:overline !important;*/
        /*letter-spacing:3px !important;*/
        color:red !important;
    }
</style>
    <!--<div id="container" style="min-width: 400px;height: 400px;background: slategrey"></div>-->
<input type="text" name="lastname" id="field3" value="Mouse" placeholder="Search W3School"/>