Clean backport for 8276847: JSException: ReferenceError: Can't find variable: IntersectionObserver
------------- Commit messages: - 8276847: JSException: ReferenceError: Can't find variable: IntersectionObserver Changes: https://git.openjdk.java.net/jfx11u/pull/65/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=65&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8276847 Stats: 183 lines in 3 files changed: 180 ins; 1 del; 2 mod Patch: https://git.openjdk.java.net/jfx11u/pull/65.diff Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/65/head:pull/65 PR: https://git.openjdk.java.net/jfx11u/pull/65
