Issue #1996238 by sun, nod_, damiankloip, Wim Leers, longwave, alexpott, Xano, mdrummond, Mark Carver, Jeff Burnz, highrockmedia, joelpittet, et al: Replace hook_library_info() by *.libraries.yml file.

Issue #2192419 by sun, mgifford: Use a WCAG-compliant fieldset (fieldgroup) for #type radios/checkboxes.

Issue #2173655 by Cottser, xjm, jessebeach, alexpott, rlmumford: Refactor theme() to _theme(); make it a private API to discourage module developers from circumventing the renderable build system.

Issue #922696 by mgifford, EvanDonovan, LewisNyman, stpaultim, jensimmons: New methods, standards for describing core themes on themes admin page (was Theme screenshots do not have adequate alt text...).

Issue #1490402 by LewisNyman, nod_, mcjim, mdrummond, rteijeiro, jessebeach, Bojhan, ry5n: Redesign tabs and the content header.

Issue #2078387 by Xano, andypost, twistor, splatio, InternetDevels, amateescu, Berdir, larowlan, vladan.me: Add an EntityOwnerInterface.

Issue #1069152 by droplet, alexandrezia, jhedstrom | ogi: Throbber in textfield is misaligned when browser hardware acceleration enabled (gfx).

Issue #2167623 by danilenko_dn, sidharthap, Nitesh Sethia, krishnan.n, aitiba, alexpott, ashwinikumar, Barrett, damiankloip, deepakaryan1988, foxtrotcharlie, ianthomas_uk, neetu morwani, nonsie, piyuesh23, Sharique, sivaji, sushantpaste, swentel, vijaycs85, YesCT: Add test for all default configuration to ensure schema exists and is correct.

Issue #2047633 by pwolanin, dawehner, kim.pepper, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit.

Revert "Issue #2047633 by dawehner, pwolanin, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit."

This reverts commit 531fd593.

Issue #2047633 by dawehner, pwolanin, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit.

Issue #1649780 by effulgentsia, jibran, Wim Leers, nod_, hefox, joelpittet, kaare, BarisW, sun, rbayliss, Cottser, fubhy: Remove first/last/odd/even classes in favor of CSS3 pseudo selectors.

Issue #2041793 by mortendk, rteijeiro, LewisNyman, magnify, axe312, zorp, mdrummond: Install-page.html.twig markup and CSS.

Issue #641734 by echoz, LewisNyman, davidtrainer, Cottser, falkendk, rteijeiro: Separate generic html elements' style into seven.base.css.

Issue #2068471 by dawehner, Crell, tim.plunkett, jibran, fubhy, larowlan: Normalize Controller/View-listener behavior with a Page object.

Issue #2001206 by andypost, penyaskito, herom, Crell, ebeyrent, DmitryDrozdik: Replace drupal_container() with Drupal::service().

Issue #675446 by mgifford, RobLoach, amateescu, nod_, longwave, oxyc, rteijeiro, tomyouds, Jelle_S, mcrittenden, Sutharsan, hansyg, Angry Dan, clemens.tolboom, droplet | Dave Reid: Change notice: Use jQuery UI Autocomplete.

Issue #2100509 by emma.maria, dcrocks, csakiistvan, Manjit.Singh: Password strength indicator for site maintenance account is aligned incorrectly on the installation screen.

Issue #2054055 by seanr: Bartik inappropriately styles all links in the footer, rather than links inside blocks in the footer, breaking contextual links in the process.

Issue #2032895 by balsama, yannickoo, corbacho, Kendall Totten: Follow-up use better technique for vertical centering.

Issue #1106344 by mgifford, BarisW: Taxonomy term reference field headers always should be rendered with a HTML header (invisible or not).

Issue #2117441 by alanburke: Fixed Stark layout broken as 'generic' classes removed from html.tpl.php.

Issue #2033959 by borisbaldinger, Gábor Hojtsy, thamas, YesCT: Improve design of language detection and selection settings page.

Issue #1982256 by mortendk, rteijeiro, tim.plunkett, LewisNyman, tlattimore, yannickoo, ry5n: Clean up html.html.twig markup.

Issue #1851414 by nod_, quicksketch, frega, dawehner, damiankloip: Convert Views to use the abstracted dialog modal.