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

[Kevin Rushforth]

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.

Looks good. I've tested this on all platforms and confirm that it fixes the issue with no regressions that I can see. I also confirm that the new test catches the problem (fails without and passes with the fix), and that this fixes [JDK-8273558](https://bugs.openjdk.java.net/browse/JDK-8273558), which can be closed as a duplicate.

I left one minor formatting comment, but unless there are other changes, it probably isn't worth changing it.

tests/system/src/test/resources/test/javafx/scene/web/testIObserver.html line 54:

> 52: <div id="output">Intersection ratio: <pre>?</pre></div>
> 53: </body>
> 54: </html>

Minor: missing newline at end of file

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Marked as reviewed by kcr (Lead).

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