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FireFox error "Selector expected. Ruleset ignored due to bad selector"


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The javascript-console of FireFox gives me these errors:

Error: Selector expected. Ruleset ignored due to bad selector.

followed by

Error: Unexpected end of file while searching for closing } of invalid rule set.

Do you have any ideas on what this means and how to resolve it?


Review your .CSS style sheet file. You probably have HTML comments in there, similar to what people put in Javascript sections. Remove those comments as shown below.

// this will cause an error in Firefox:

       .styling { blah... }

// this is ok:

       .styling { blah... }

Content-type: text/html


You are on page 2 of 2, other pages: 1 [2]
2010-01-26, 22:48:59
[hidden] from Australia  
I had a similar problem, turns out the html was saved as UTF-16, re-encoded as UTF-8 and everything worked. ie, the problem was not in the css file but in the html file.
2010-01-29, 05:59:09   (updated: 2010-01-29, 06:06:51)
anonymous from Germany  
Under some circumstances FF adds something like this to my code:
<style media='screen' type='text/css'>
.dipkTab{ font-family:Helvetica;font-size:12px;text-align:center;backgckground-color:#EEEEEE;border:1px solid black;};
As you can see there is the before mentioned semicolon after the closing }.
Recognized it while using Firebug. Yet I don't know why this happens.
2010-01-29, 07:10:45
anonymous from Germany  
Sorry, my mistake. That piece of code was buried in our source. Well, at least that verifies the '};' error.
2010-05-06, 03:53:42
anonymous from Latvia  
2012-06-06, 19:10:05
anonymous from London, United Kingdom  
Thank you, this helped me too (I also had a selector starting with a number)
2012-07-10, 11:13:23
anonymous from Canada  
but if you HTML is saved in unicode ... FF goes nuts...

This was exactly the cause of my identical issue. Changed the file encoding to ANSI and everything back to normal. THANK YOU!
2013-03-25, 21:03:10
anonymous from United States  
frederick j pilgeram
Eden, Montana
Born on June 15, 1959

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