::before with input in Firefox

Question

I'm trying to put some content before an input tag using CSS pseudo-class ::before. It works in Chrome but not in Firefox. What seems to be the problem with Firefox?

Here's a snippet:

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

<input type="radio" name="gender" class="radio" value="male">male
<input type="radio" name="gender" class="radio" value="female">female

...and here's the outcome. Chrome works just fine:

but there are no changes in Firefox:

This is what you are looking for: http://stackoverflow.com/questions/4574912/css-content-generation-before-or-after-input-elements — Andrew, Jun 06 '16 at 09:22
This would be even better: http://stackoverflow.com/a/4660434/2003702 — thepio, Jun 06 '16 at 09:25
Well if you want to have the red rings around the inputs try adding a `span` and put the before on that — Andrew, Jun 06 '16 at 09:26

score 27 · Accepted Answer · edited Aug 25 '17 at 13:21

27

According to the specification.

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 and :after should only work on the element which can act as a container of content. <input> cannot contain any content so it should not support those pseudo-elements. Chrome supports because it does not follow the spec (or bug?).

edited Aug 25 '17 at 13:21

Bryan Ash

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answered Jun 06 '16 at 09:31

Jimmy Ko

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In other words, Chrome plays by its own rules. Thanks for this info! – Aleksandar Belic Jun 06 '16 at 09:38
Interesting that Safari copies chrome on this one and displays pseudo elements for inputs. – Levidps Nov 01 '20 at 01:36
2

@Levidps this issue may come rom Webkit, Chrome's engine is forked from Webkit – Jimmy Ko Nov 03 '20 at 17:13

::before with input in Firefox

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