HTML5自定义新标签属性

.data_custom { display:inline-block; position: relative; }
.data_custom:hover { color: transparent; }
.data_custom:hover:after {
    content: attr(data-hover-response);
    color: black;
    position: absolute;
    left: 0;
}
<a class="data_custom" data-hover-response="我说过不要碰我！" href="#">不要碰我，雅蠛蝶~~</a>