Your example works for me as expected. It opens the drop down, and I can select an option. All this inside the details tag.
I'm using Chrome 21.0.
Now, considering the details tag is at this point only supported in Chrome, and that the HTML 5 spec which this tag belongs to is still in development I don't think its really worth it to spend too much time debugging it.
However, considering the example works, I'd say its something in your actual code, and/or version of Chrome.
Can you show us your actual code?
Or try this one and see if it works?
Code:
[b][COLOR=#000080]<!DOCTYPE[/color][/b] [COLOR=#009900]html[/color][b][COLOR=#000080]>[/color][/b]
[b][COLOR=#0000FF]<html>[/color][/b]
[b][COLOR=#0000FF]<head>[/color][/b]
[b][COLOR=#0000FF]<title>[/color][/b]Details Tag[b][COLOR=#0000FF]</title>[/color][/b]
[b][COLOR=#0000FF]</head>[/color][/b]
[b][COLOR=#0000FF]<body>[/color][/b]
[b][COLOR=#0000FF]<details>[/color][/b]
[tab][tab][b][COLOR=#0000FF]<select>[/color][/b]
[tab][tab][tab] [b][COLOR=#0000FF]<option>[/color][/b]red[b][COLOR=#0000FF]</option>[/color][/b]
[tab][tab][tab] [b][COLOR=#0000FF]<option>[/color][/b]green[b][COLOR=#0000FF]</option>[/color][/b]
[tab][tab][tab] [b][COLOR=#0000FF]<option>[/color][/b]blue[b][COLOR=#0000FF]</option>[/color][/b]
[tab][tab] [b][COLOR=#0000FF]</select>[/color][/b]
[b][COLOR=#0000FF]</details>[/color][/b]
[b][COLOR=#0000FF]</body>[/color][/b]
[b][COLOR=#0000FF]</html>[/color][/b]
----------------------------------
Phil AKA Vacunita
----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.
Web & Tech