css如何清除form表单样式的示例

::-webkit-input-placeholder{color: #333;}
:-moz-placeholder{color: #333;}
:-moz-placeholder{color: #333;} 
:-ms-input-placeholder{color: #333;}

input::-webkit-outer-spin-button,input
::-webkit-inner-spin-button{-webkit-appearance: none !important;}input[type="number"]{-moz-appearance:textfield;}

direction: rtl;

-webkit-appearance: none;

resize:none;

<p class="ta_box">
    <textarea class="ta"></textarea></p>

.ta_box{
    width: 400px;
    height: auto;
    overflow: hidden;
    border: 1px solid #999;
    box-sizing: border-box;
}.ta{
    min-height: 30px;
    outline: none;
    resize: none;
    width: 500px;
    box-sizing: border-box;
    vertical-align: top;
    border: none;
}

$.fn.autoHeight = function () {    function autoHeight (elem) {
        elem.style.height = 'auto';
        elem.scrollTop = 0;  //防抖动
        elem.style.height = elem.scrollHeight + 'px';
    }    this.each(function () {
        autoHeight(this);
        $(this).on('keyup',function () {
            autoHeight(this);
        });
    });
}
$('textarea').autoHeight();