According to the doc:
http://docs.jquery.com/Traversing/is
"If no element fits, or the expression is not valid, then the response
will be 'false'."
But in this test case, I have to use "try catch" because of the error.
Maybe an another bug?

On Feb 2, 6:25 am, John Resig <[email protected]> wrote:
> All the characters that are failing here:
> ~(+[>,
>
> are all ones that are matched in the main chunker expression in Sizzle:
> [^ >+~,(\[]
>
> I'm trying to think if there might be a better workaround here. I
> don't think it's a *huge* priority since these selectors are so
> bizarre to begin with, but I would like to get it fixed.
>
> Thanks for the test case!
>
> Also, do you think you could file a bug on it? 
> Thanks.http://dev.jquery.com/newticket
>
> --John
>
> On Sun, Feb 1, 2009 at 11:31 AM, Shawphy <[email protected]> wrote:
>
> > Firstly,I admit that I would be so crazy.
> > I tested ALL the special characters on my keyboard which are ~...@#$%^&*
> > ()_+-=[]\{}|;':"/.,?><
> > I removed < and " because they will break the page.
> > And I know w3c says "ID and NAME tokens must begin with a letter ([A-
> > Za-z]) and may be followed by any number of letters, digits ([0-9]),
> > hyphens ("-"), underscores ("_"), colons (":"), and periods (".").".
> > (http://www.w3.org/TR/html4/types.html#h-6.2)
> > I did this just because I am so curious about whether jQuery 1.2.6 and
> > jQuery 1.3.1 will pass the test.
>
> > the following addresses are the tests:
> >http://shawphy.com/demo/selector/jQuery-1-2-6-selector-test.html
> >http://shawphy.com/demo/selector/jQuery-1-3-1-selector-test.html
>
> > In jQuery 1.2.6,elements with these IDs fail in the test:
>
> > te\st
> > te\
> > \st
>
> > In jQuery 1.3.1,elements with these IDs fail in the test:
>
> > te~st
> > te(st
> > te+st
> > te[st
> > te\st
> > te>st
> > te,st
> > te~
> > te(
> > te+
> > te[
> > te\
> > te>
> > te,
> > ~st
> > (st
> > +st
> > [st
> > \st
> >>st
> > ,st
>
> > If Sizzle fix these ,it will be so slow, will it ?
> > I post this mail  just for knowing which of them will be fixed?All or
> > some of them?
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