：before和：after CSS属性在MPDF中不起作用

Question

:before和:after CSS属性在mpdf库中被忽略。计数器增量和内容CSS是否有其他选择？

    <style>
                body {
                    counter-reset:counter; 
                }
                .list {
                   display: table;  
                   color:red;                           
                }
                .list:before {                
                    font-size: 16pt;
                    display: table-cell;
                     counter-increment: counter; 
                    content: counter(counter) ". ";
                    padding-right: 5px;
                }
             </style>
            <h5>Hello World</h5>
            <p class="list">first.</p>
            <p class="list">second.</p>

这是示例html。