The test is expecting us to return NULL in case open() has not been called. We throw an exception in IE. Iā€™d pre fer if the spec says *ā€œ*MUST return null OR an exception*ā€* otherwise I fear sites today will be broken.

How would that help sites that expect an exception, since it would still be conforming for the UA to return null? If anything, your proposal seems to make it harder for sites to code against the spec.

/ Jonas

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