@frontend_worker/search-selector/src/styles/mixins/common.less

《远程搜索+单选》组件区别于element-ui或iview组件库的select远程搜索， ①将头部显示的值和下拉选项显示的值独立开来， ②避免远程加载时头部默认值显示异常， ③支持插槽自定义 ④将搜索框值放置于下拉弹框里面

.placeholder(@color: @input-placeholder-color) {
    // Firefox
    &::-moz-placeholder {
        color: @color!important;
        opacity: 1; // Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526
    }
    // Internet Explorer 10+
    &:-ms-input-placeholder {
        color: @color!important;
    }
    // Safari and Chrome
    &::-webkit-input-placeholder {
        color: @color!important;
    }
}
// for select and input like component's arrow
.inner-arrow() {
    position: absolute;
    top: 50%;
    right: 8px;
    line-height: 1;
    margin-top: -7px;
    font-size: @font-size-base;
    color: @subsidiary-color;
    transition: all @transition-time @ease-in-out;
}

.reset-component() {
    font-family: @font-family;
    font-size: @font-size-base;
    line-height: @line-height-base;
    color: @text-color;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    list-style: none;
}