RFR: 8276847: JSException: ReferenceError: Can't find variable: IntersectionObserver

[Jose Pereda]

On Wed, 10 Nov 2021 18:20:11 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

> This PR enables intersection observer support for WebKit, and includes a system test.

Worth pointing out that [JDK-8273558](https://bugs.openjdk.java.net/browse/JDK-8273558) gets fixed with this PR.

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PR: https://git.openjdk.java.net/jfx/pull/664