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I was trying to add some effects for visited links, then I got this problem.
Here is the code: http://dabblet.com/gist/5447894
Only Opera can successfully change the content of :before pseudo-elements. All other browsers are fail. Did I miss anything? Thanks
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CSS ::before and ::after pseudo-elements allow you to insert “content” before and after any non-replaced element (e.g. they work on a <div> but not an <input> ). This effectively allows you to show something on a web page that might not be present in the HTML content.
::before (:before) In CSS, ::before creates a pseudo-element that is the first child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.
The :visited CSS pseudo-class represents links that the user has already visited.
CSS - The ::selection Pseudo-elementThe ::selection pseudo-element matches the portion of an element that is selected by a user. The following CSS properties can be applied to ::selection : color , background , cursor , and outline .
The allowed (= not ignored) CSS properties of visited links are color, background-color, border-*-color, outline-color and, column-rule-color (more under certain circumstances).
This is to prevent history stealing attacks. See this article for further details.
So you can, technically, set a :before pseudo class for :visited links, but it will be ignored and appears as if the links are not visited. This is not a bug, it's a feature ;)
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There is a very limited range of possibilities for styling :visited links in modern browsers for privacy reasons – so that you couldn't detect which sites the user has visited before by checking the computed style with javascript.
The allowed properties for styling for :visited links is
colorbackground-colorborder-color (and its sub-properties)outline-colorEven so, you cannot get the values of the computed style for visited links via javascript.
You can read more about it here.
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