RFR: 8328673: Convert closed text/html/CSS manual applet test to main [v3]

[Prasanta Sadhukhan]

> Couple closed manual applet text/html/CSS tests are converted to main based and opensourced

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Review comment update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18424/files
  - new: https://git.openjdk.org/jdk/pull/18424/files/d846e61f..fbc0b821

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18424&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18424&range=01-02

  Stats: 6 lines in 2 files changed: 1 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18424.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18424/head:pull/18424

PR: https://git.openjdk.org/jdk/pull/18424