Compare with the parsed result from REXML backend
Update the HTML boolean attributes per the HTML 5.1 spec

- Add attributes `allowfullscreen`, `default`, `inert`, `sortable`,
`truespeed`, `typemustmatch`.
- Fix attribute `seamless` (previously misspelled `seemless`).
- Use `assert_dom_equal` instead of `assert_equal` in test.
fix typos
Merge pull request #10953 from acapilleri/fix_typos

fix typos
'json' gem is no more required under JRuby
cleanup, remove trailing whitespace from AR changelog
regression test + mysql2 adapter raises correct error if conn is closed.
Merge pull request #10925 from senny/10917_test_to_prevent_regression

regression test + mysql2 adapter raises correct error if conn is closed.
Merge pull request #10955 from arunagw/jruby_json_not_required

'json' gem is no more required under JRuby
fixture setup does not rely on `AR::Base.configurations`.

As you can also configure your database connection using `ENV["DATABASE_URL"]`,
the fixture setup can't reply on the `.configurations` Hash.

As the fixtures are only loaded when ActiveRecord is actually used
(`rails/test_help.rb`) it should be safe to drop the check for an existing configuration.
Merge pull request #10907 from senny/fixtures_and_database_url

fixture setup does not rely on `AR::Base.configurations`.
Make test name descriptive and add reference to original regression commit
Merge pull request #10533 from vipulnsward/fix_test

Fix test, addresss => address
Merge pull request #10949 from alexpeattie/update_html_boolean_attrs

Update HTML boolean attributes per the HTML 5.1 spec
Updated the doc for const_regexp [ci skip]
Merge pull request #10954 from arunagw/update_docs_for_const_regexp

Updated the doc for const_regexp [ci skip]
Merge pull request #10727 from pacoguzman/fix-xml-mini-tests

Fix XmlMini different backends tests