伪元素改变HTML5 表单验证提示的默认样式实例页面

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代码：

CSS代码：
::-webkit-validation-bubble { min-width:152px; margin-top: -1px;}
::-webkit-validation-bubble-arrow { border: 1px solid #F7CE39; background: #FFFBC7; /* position:relative; */ top: 4px; left: 0px; }
::-webkit-validation-bubble-arrow-clipper { text-align: center; }
::-webkit-validation-bubble-heading { color: #444; }
::-webkit-validation-bubble-message { border: 1px solid #F7CE39; background: #FFFBC7; border-radius: 3px; }
::-webkit-validation-bubble-text-block { font-size: 12px; }
HTML代码：
<form>
    <input type="email" required><input type="submit">
</form>

效果：