RFR: 8325690: The scrollable element <div> with non-interactive content is not tabbable [v23]

[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 two additional commits since the last revision:

 - Add tab order to plain text
 - Add tab order to plain text

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17819/files
  - new: https://git.openjdk.org/jdk/pull/17819/files/a0ee85d7..eda64006

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=22
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=21-22

  Stats: 6 lines in 1 file changed: 0 ins; 1 del; 5 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