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Applying CSS to Opera only


[Edit: 080828] This hack targets only Opera 9 and below, but fails in (at least) v9.52. You should not use it unless you're specifically targeting Opera 9 and below.

If you ever need to apply certain styles to Opera only, there is an easy way that I found in Jeff Starr's post, 'CSS Hack Dumpster'. All you need to do is prefix your selector with html:first-child.

For example, let's see how you would add a left margin of 10px to all paragraphs in all browsers except Opera:

p {
  margin-left: 10px;

html:first-child p {
  margin-left: 0;

This hacks validates and seems reasonably safe. As always, it's a risk to use hacks in your CSS (what would happen if, say, Internet Explorer 12 matched html:first-child? Any websites using this hack wouldn't work correctly in IE12). I'm still going to use it though, it seems quite safe to me.

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7 comments to “Applying CSS to Opera only”

  1. #01 By hakukoneoptimointi, 080828 at 20:16

    html:first-child selector also applies to Mozilla based browsers

  2. #02 By dense13, 080828 at 21:39

    Are you sure? I don't think so. If you've tested it, can you tell me what version and OS are you using?

    But: I recently upgraded Opera to v9.52 and here html:first-child doesn't seem to have any effect. So I'll have to look for another Opera hack. I'll update this post as soon as I get a chance to have a look at this.

  3. #03 By hakukoneoptimointi, 080908 at 18:45

    You're right.. my bad. I tested it again with Firefox 3 on XP and
    Vista - didn't work. And it doesn't seem to work in Opera 9.51
    either. One Opera hack I've been using is: @media all and
    (min-width: 0px){ selector{property: value;} } Works with recent
    versions of Opera

  4. #04 By Alex Thomas, 081114 at 01:56

    This effects IE too...

  5. #05 By dense13, 081114 at 08:45

    I don't think so, which version of IE? I've tried 7, 6 and 5.5, and it doesn't affect any of those.

    But I insist: this technique is not useful anymore, because it won't work in newer versions of Opera. Which proves that using hacks is dangerous and should be avoided as much as possible. :)

  6. #06 By latinsydney, 110113 at 15:09

    thanks hakukoneoptimointi, the hack works on Opera 10.52

  7. #07 By Alan-A, 110123 at 01:18

    Hakukoneoptimointi's hack unfortunately does not work in Opera 11.

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