Issue #2566771 by Cottser, mortendk, jstoller, LewisNyman, mdrummond, Gints Ērglis, sqndr, Chernous_dn, Manjit.Singh, axe312, emma.maria, davidhernandez, lauriii, jaxxed, akalata: [Voltron patch] Move all remaining *.theme.css to Classy

Issue #2574917 by andrewmacpherson, googletorp: Regression: vertical tabs are not keyboard accessible

Issue #1239930 by irunflower, mgifford, babruix, peterpoe, ohthehugemanatee, droplet, nod_, Cottser, frazras, xjm: states.js appends span.form-required to every label of a dependent field

Issue #2405057 by nlisgo, Manjit.Singh, ctraltdel, madhavvyas, avitslv, LewisNyman, emma.maria, joelpittet, dernetzjaeger, wmortada, karolus, cilefen, Noe_, davidhernandez, idebr: Replace arrow-asc and arrow-desc images with Libricons and implement using CSS

Issue #2473945 by Cottser, rachel_norfolk, axe312, davidhernandez, yannickoo, emma.maria, cilefen, akalata, jaxxed, LewisNyman: Prefix form-item classes with js-

Issue #2554219 by nod_, larowlan, tim.plunkett, regilero, droplet, japerry, samuel.mortenson, Pere Orga, effulgentsia, benjy, Gábor Hojtsy, greggles, Wim Leers, David_Rothstein, pwolanin, neclimdul, EclipseGc, znerol: Port Cross-site Scripting - Ajax system fixes from SA-CORE-2015-003 to Drupal 8

Issue #2427213 by mortendk, andypost, jwilson3, pjbaert, corbacho, Manuel Garcia, Jeff Burnz, andrewmacpherson: Replace feed.png with feed.svg

Issue #1639012 by nod_, corbacho, sun, droplet, seutje, tim.plunkett: Guard against broken behaviors

Revert "Revert "Issue #2510104 by pwolanin, nod_, Fabianx, Wim Leers, droplet, Pere Orga: Convert drupalSettings from JavaScript to JSON, to allow for CSP in the future""

This reverts commit e8e883f9.

Issue #2473951 by Cottser, cilefen, yannickoo, davidhernandez, LewisNyman: Prefix form-required classes with js-

Revert "Issue #2510104 by pwolanin, nod_, Fabianx, Wim Leers, droplet, Pere Orga: Convert drupalSettings from JavaScript to JSON, to allow for CSP in the future"

This reverts commit 94615a13.

Issue #2510104 by pwolanin, nod_, Fabianx, Wim Leers, droplet, Pere Orga: Convert drupalSettings from JavaScript to JSON, to allow for CSP in the future

Issue #1835016 by googletorp, nod_, KarenS, Sharique, Nitesh Sethia, mpdonadio: Polyfill date input type

Issue #2500527 by dawehner, tim.plunkett, effulgentsia: Rewrite \Drupal\file\Controller\FileWidgetAjaxController::upload() to not rely on form cache

Issue #1305882 by dawehner, nod_, Fabianx, Steven Jones, sun, nlisgo: drupal_html_id() considered harmful; remove ajax_html_ids to use GET (not POST) AJAX requests

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions

Issue #2472177 by Dom., nod_, drubb, mgifford: Collapsible fieldset have duplicated and wrong aria-expanded

Issue #2488884 by pixelmord, tim.plunkett, droplet: Machine name HTML5 validation fails when field is hidden

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2473953 by mortendk, rteijeiro, rachel_norfolk, Cottser, aburrows, LewisNyman: Prefix form-submit classes with js-

Issue #1533366 by nod_, valthebald, Jelle_S, Wim Leers: Simplify and optimize Drupal.ajax() instantiation and implementation

Issue #2473949 by mortendk, rteijeiro, rachel_norfolk, Cottser, LewisNyman: Prefix form-type-* classes with js-

Issue #2472323 by dawehner, neclimdul, Crell, kim.pepper, nod_, Wim Leers, larowlan, jibran, pwolanin, catch: Move modal / dialog to query parameters