Declaring same css for more than one id?

How do I do it.

#foo, #ball, #tre开发者_Python百科e h1 {color: #892828;}

Does not seem to work?

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if you want to style all H1 under those Ids, you have to repeat H1 for every one as they don't share anything:

#foo h1, #ball h1, #tree h1 {color: #892828;}

what you wrote is equivalent to:

#foo {color: #892828;}
#ball {color: #892828;}
#tree h1 {color: #892828;}

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You could also assign the same class to each of those h1s and style using that class.