Are these style recognized by all browsers of all versions?

#parent div { float:right; }
#parent > div { float:right; }

Most important开发者_JAVA百科ly:firefox and IE

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No. Some browsers don't support CSS at all (lynx for example).

The glib answer aside, among browsers you probably care about, the child selector is not supported in Internet Explorer 6.

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See this chart:

#parent > div is supported by ALL browsers EXCEPT IE6.

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See Quir}{smode's master compatibility table for answers to all these types of questions.

Click here for the CSS Compatibility table