Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2398469 by DickJohnson, LewisNyman, emma.maria, kandra, mherchel: Clean up the "Featured-top" component in Bartik

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

Issue #2306407 by lauriii, penyaskito, mortendk, pakmanlh, Wim Leers, ypogue: Remove breadcrumb from page template

Issue #2395825 by emma.maria, jennyOlsen, DickJohnson: Remove closing tag comments in template files

Issue #1340640 by tadityar, DickJohnson, emma.maria, Scionar:  Remove "Highlighted" region from Bartik

Issue #1903048 by DickJohnson, emma.maria, lauriii, mbrett5062, JamesLefrère, lilGemVinny: Revise Bartik template indentation inline with best practices

Issue #1077578 by mgifford, mjohnq3, sqndr, zniki.ru, pwieck, rpayanm, Risse, visabhishek: [Followup] Convert bartiks page.tpl.php to HTML5

Issue #1869476 by rteijeiro, LewisNyman, lauriii, Wim Leers, mdrummond, swentel, hosef, cbiggins, larowlan, sun, EclipseGc, Gábor Hojtsy: Convert global menus (primary links, secondary links) into blocks.

Issue #1529814 by mgifford, JohnAlbin, ibullock, dcmouyard, mark.labrecque, andrewmacpherson, vegantriathlete: Fixed skiplink behavior for Webkit browsers.

Issue #2052473 by ricky.middaugh, lokapujya, Jalandhar, mgifford, jessebeach, BarisW, falcon03: Add aria-label or aria-describedby attributes to all <nav> elements.

Issue #1880488 by djroshi, konstantin.komelin, LewisNyman, jibran, rteijeiro: Added Make menu collapsible on small screen resolutions.

Issue #2226185 by galooph, filijonka, Cottser: Remove @ingroup themeable from core theme Twig template docblocks.

Issue #1843650 by Mark Carver, jenlampton, Cottser: Remove the process layer (hook_process() and hook_process_HOOK).

Issue #1589968 by cr0ss, Cottser, Pancho, DarthDrupal, Mark Carver: Move Title from process to preprocess, remove template_process_page().

Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files

Issue #1363112 by mparker17, mgifford, tlattimore, Jacine, dcmouyard, bowersox, ry5n, ahdiaz: Simplify names of 'element-x' helper classes.

Issue #1961870 by Cottser, foopang, kgoel, shanethehat, tlattimore, c4rl, joelpittet, thedavidmeister: Convert page.tpl.php to Twig.