The CSS Selectors specification defines the `:root` pseudo-class that matches root nodes: https://www.w3.org/TR/selectors-4/#the-root-pseudo
JavaFX uses the non-standard `.root` style class for the same purpose. We should also support the `:root` pseudo-class for increased compatibility of JavaFX CSS with the web specification. ------------- Commit messages: - Set :root pseudo-class on sub-scene root node - Set :root pseudo-class on root node Changes: https://git.openjdk.org/jfx/pull/1652/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1652&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8345188 Stats: 62 lines in 5 files changed: 55 ins; 4 del; 3 mod Patch: https://git.openjdk.org/jfx/pull/1652.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1652/head:pull/1652 PR: https://git.openjdk.org/jfx/pull/1652
