RFR: JDK-8325690: The scrollable element <div> with non-interactive content is not tabbable [v4]

[psoujany]

> The scrollable element `<div>` with non-interactive content is not tabbable. Grid columns in the javadoc stylesheet has overflow: auto, which is failing Accessibility checks.
> https://bugs.openjdk.org/browse/JDK-8325690

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

  Add tabindex to plain text for div columns

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17819/files
  - new: https://git.openjdk.org/jdk/pull/17819/files/a0f2773e..4b9e82bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=02-03

  Stats: 152 lines in 15 files changed: 0 ins; 0 del; 152 mod
  Patch: https://git.openjdk.org/jdk/pull/17819.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17819/head:pull/17819

PR: https://git.openjdk.org/jdk/pull/17819