Crash when adding unsupported selector to style sheet

When using addRule() to add a CSS rule with a selector that IE6 doesn't support, the browser hangs.
Even when you close Explorer after trying the buggy code, your system may remain very slow. In that case, rebooting helps.

Test page. Workaround is not included.
Reported by Martijn.

(Orphaned), Explorer 5-6 Windows | Reported on 29 November 2004.

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