[CSS spec for background-position](https://www.w3.org/TR/CSS22/colors.html#propdef-background-position) mention the initial value should be "0% 0%" but JDK has the value as "null". Rectified the spec violation. No regression is seen in client tests..
------------- Commit messages: - fix - 6245410: javax.swing.text.html.CSS.Attribute: BACKGROUND_POSITION is not w3c spec compliant Changes: https://git.openjdk.org/jdk/pull/13114/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13114&range=00 Issue: https://bugs.openjdk.org/browse/JDK-6245410 Stats: 43 lines in 2 files changed: 42 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/13114.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13114/head:pull/13114 PR: https://git.openjdk.org/jdk/pull/13114
