RFR: 8325690: The scrollable element <div> with non-interactive content is not tabbable [v21]

[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

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17819/files
  - new: https://git.openjdk.org/jdk/pull/17819/files/885fa89f..f85d6490

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=20
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=19-20

  Stats: 11 lines in 1 file changed: 10 ins; 0 del; 1 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