Results:

Firefox 13.0.1

• Pseudos apply to <object>, <hr>, <input type="image"> (!)
• From the HTML5 list, the <embed> is to only one who pseudos apply to.

Chrome 19.0.1084.56

• Whilst pseudos apply to most input elements, it's curios that on elements like <input type="submit">, <input type="reset"> and <input type="button"> pseudo-elements do not apply. <textarea>, <object> and <hr> also support pseudos applied.
• Pseudo-elements apply here to all new HTML5 form inputs.

Safari 5.1.7

• Safari, who is running on WebKit (same as Chrome) behave quite different though. From the HTML4 list, the <object>, <hr>, <input type="checkbox">, <input type="radio"> and <input type="file"> do support pseudos applied.
• Comparing to Chrome, from the HTML5 list, elements like <audio>, <video> and <keygen> are the only one who support pseudos. Now, that's a quite big difference comparing to Chrome!

Safari on iOS & Mac (OSX)

• Pseudo-elements apply to <object>, <hr>, <input type="checkbox">, <input type="radio">, <input type="file"> and <keygen>.

Opera 12.00

• On Opera, there are few replaced elements that allow pseudos: <object>, <br> and <hr>. The surprise from this list is definitely the <br> element.

IE10

• Apparently, while testing on IE10 Developer Preview and IE10 Platform Preview #4, I noticed only these two elements that accepts pseudos: <hr> and <keygen>.

IE 9

• The following elements are the only ones supported here: <object>, <hr>, <keygen>.

HTML4 stuff

<img>

<textarea>

<select>

<object>

<br>

<hr>

<iframe>

<input type="text">

<input type="password">

<input type="checkbox">

<input type="radio">

<input type="submit">

<input type="reset">

<input type="file">

<input type="image">

<input type="button">

HTML5 stuff

<audio>

<video>

<canvas>

<embed>

<keygen>

<input type="color">

<input type="date">

<input type="datetime">

<input type="datetime-local">

<input type="email">

<input type="month">

<input type="number">

<input type="range">

<input type="search">

<input type="tel">

<input type="time">

<input type="url">

<input type="week">

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