RFR: 8327492: Remove applet usage and update DisposeInActionEventTest.html [v12]

[Alisen Chung]

> Root cause of the test failure was fixed with https://bugs.openjdk.org/browse/JDK-8316931, updating this test since the other fix also included a test update.

Alisen Chung has updated the pull request incrementally with four additional commits since the last revision:

 - instructions update
 - instructions update
 - instructions update
 - instructions update

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/17838/files
  - new: https://git.openjdk.org/jdk/pull/17838/files/60bb2701..a4eef7c3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17838&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17838&range=10-11

  Stats: 8 lines in 1 file changed: 1 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/17838.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17838/head:pull/17838

PR: https://git.openjdk.org/jdk/pull/17838