Meaningful Changes

For elements using disable-upgrade, the detached() callback should now only be called after the element has upgraded.

Raw Notes

Update custom-style.html (commit)
Add more tests. (commit)
Avoid calling detached before an element is readied. When an element is readied, if attachment is pending only call attached if the element is actually attached. (commit)
Fixes #4550. Ensure that detached cannot run before an element is “readied.” This fixes an issue that allowed an element with disable-upgrade to process the detached callback. (commit)
Change dev version to 1.x (commit)
[ci skip] Update CHANGELOG (commit)