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# ECMAScript tests
This directory contains tests related to the [ECMA-262]( and [ECMA-402]( specifications.
Although these specifications are already covered through [Test262](, occasionally it’s useful to have Web Platform Tests coverage for a subset of ECMAScript functionality. Examples include:
- Any functionality that ECMAScript specifies as “implementation-defined” despite Web Compatibility requiring specific semantics. ([example](
- Any ECMAScript functionality that needs to be reported via (for [example](, because it’s included in Interop 2023).