这是一个片段：

input::before {	content: '';	display: block;	width: 13px;	height: 13px;	border-radius: 50%;	box-shadow: 0px 0px 5px #9F0002 inset;}

malefemale

……这就是结果. Chrome工作得很好：

但Firefox没有变化：

Authors specify the style and location of generated content with the :before and :after pseudo-elements. As their names indicate, the :before and :after pseudo-elements specify the location of content before and after an element’s document tree content. The ‘content’ property, in conjunction with these pseudo-elements, specifies what is inserted.

：before和：after应该只对可以充当内容容器的元素起作用. <输入>不能包含任何内容,因此它不应该支持那些伪元素. Chrome支持,因为它不符合规范(或错误？).