Issue #2425691 by pjbaert, kepford, drupalninja99: Remove .leaf/.menu-item--leaf from menu CSS components

Issue #2407733 by mortendk, rteijeiro, sivaji@knackforge.com: Remove classes from system templates i*.html.twig

Issue #2226189 by alvar0hurtad0, sivaji@knackforge.com, mherchel, emma.maria, LewisNyman, tmjoseantonio: Style the modal in Bartik

Issue #2400863 by alex-arriaga, MacMladen, emma.maria, oriol_e9g, idebr, betovarg: Add the correct classes and styles for disabled buttons in Bartik

Issue #1663210 by mortendk, rootwork, idebr, vks7056, ishmael-sanchez, LewisNyman, joelpittet, Manjit.Singh, Manuel Garcia, b0unty, prajaankit, alansaviolobo, atu: Clean up css in the User module

Issue #2423781 by alexpott, dawehner, cosmicdreams, davidhernandez, LewisNyman: Firefox crash using a modal

Issue #2260061 by Jelle_S, attiks, Wim Leers, mdrummond, mgifford, holist: Responsive image module does not support sizes/picture polyfill 2.2

Issue #1189806 by mortendk, lauriii, jussil, Dragan Eror, cluke009, DickJohnson, rteijeiro, tlattimore: Convert aggregator-item.html.twig to HTML5

Issue #2408467 by idebr, DickJohnson, LewisNyman, monobasic: Rewrite pager component inline with our CSS standards

Issue #2349759 by davidhernandez, mortendk, rteijeiro, harish86, Sumit kumar, saki007ster, Mukeysh, brahmjeet789, nitishchopra, falkendk, Maninder, Vidushi Mehta, Ashish sandil, jitendra verma, crowdcg, sivaji@knackforge.com, dernetzjaeger: Copy system templates to Classy.

Issue #2349677 by davidhernandez, Xen, emma.maria, runand, mortendk: Copy filter templates to Classy

Issue #2349683 by davidhernandez, mortendk, Manuel Garcia, emma.maria, DickJohnson: Copy forum templates to Classy

Issue #1164784 by emma.maria, kattekrab, tadityar, DickJohnson, vermario, luco, Jeff Burnz, davidhernandez, David_Rothstein, webchick, Bojhan, LewisNyman, alexpott: “Triptych” term is not widely understood; add "Featured top" and "Featured bottom"

Issue #2349625 by mortendk, alexpott, lauriii, Manuel Garcia, saki007ster, emma.maria, DickJohnson: Copy block templates to Classy

Issue #2398447 by emma.maria, rootwork, Maninder, ramkrk, DickJohnson, idebr: Remove the "typography" CSS file in Bartik

Issue #2408581 by rachel_norfolk, zach.bimson, MarkoT91, Ieva Uzule, idebr, LewisNyman, sarav.din33: Clean up the "help" component in Bartik

Issue #2402061 by emma.maria, Katiemouse, er.pushpinderrana: Reusable heading classes should be "heading-*" not "header-*"

Issue #2227121 by emma.maria, Vally79, DickJohnson, Jill L, frankfarm, rootwork, jamesquinton, Rajendar Reddy, krueschi, ericxb, seiplax, bluegriff: The "Default country" dropdown element overflows the installer container at certain widths

Issue #2402639 by Katiemouse, nitvirus, lakshminp, dernetzjaeger, emma.maria, gippy, kporras07, john guant, Prashant.c: Rename the footer regions in Bartik

Issue #2349517 by emma.maria, b0unty, idebr, tarekdj, lauriii, Manjit.Singh, adci_contributor: Fix RTL for Bartik's vertical tabs

Issue #2400233 by emma.maria, rpayanm, Katiemouse, LewisNyman: Add reusable heading classes to Bartik

Issue #2417705 by idebr: Autocomplete suggestions visual regression after modal and jQuery UI update

Issue #2415855 by emma.maria: A forgotten reference to list.css in Bartik's info file is giving core a 404 error