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

[Prasanta Sadhukhan]

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

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Commit messages:
 - 8328673: Convert closed text/html/CSS manual applet test to main

Changes: https://git.openjdk.org/jdk/pull/18424/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18424&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328673
  Stats: 162 lines in 2 files changed: 162 ins; 0 del; 0 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