RFR: 8345348: CSS media feature queries [v15]

[Michael Strauß]

> Implementation of [CSS media queries](https://gist.github.com/mstr2/cbb93bff03e073ec0c32aac317b22de7).

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

  use equality instead of identity

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1655/files
  - new: https://git.openjdk.org/jfx/pull/1655/files/be17d367..7bedd63f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=14
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=13-14

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1655.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1655/head:pull/1655

PR: https://git.openjdk.org/jfx/pull/1655