RFR: JDK-8325690: The scrollable element <div> with non-interactive content is not tabbable [v3]

[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 tabindex to plain text for div column elements
 - Add tabindex to plain text for div column elements

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17819/files
  - new: https://git.openjdk.org/jdk/pull/17819/files/3bd476af..a0f2773e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17819&range=01-02

  Stats: 30 lines in 3 files changed: 28 ins; 0 del; 2 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