<vested interest hat on> For too long it was considered OK to have a spec with either no tests, or tests that focused on the wrong thing ("is it possible to im

<vested interest hat on> For too long it was considered OK to have a spec with either no tests, or tests that focused on the wrong thing ("is it possible to implement this spec" vs "do implementations behave in compatible ways"). It is still considered too OK for browser vendors to write their own tests for a feature and not share them with the rest of the community. However, pressure from other platforms is changing attitudes here as it becomes increasingly apparent that without a stronger degree of interoperability, developers will vote with their feet and target platforms with fewer bugs to trip over.