Issue #2033211 by LewisNyman, tim.plunkett, JamesLefrère | yannickoo: Move Seven CSS files into css directory.

Issue #2301599 by Cottser, mparker17: Fixed Regression: Bartik's field--taxonomy-term-reference.html.twig doesn't properly output label attributes.

Issue #2300313 by blueminds: Fixed Seven theme competely overrides the $form['#attached'] on node form.

Issue #2227601 by mparker17, cs_shadow, swentel, lanchez, mgifford: Added a "Visually-hidden" field label formatter.

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

Issue #662940 by rootwork, tim.plunkett, emclaughlin, sqndr, ogi: Fixed "Lucida Sans Unicode" may match ugly "Lucida Bright" instead of "Lucida Sans".

Issue #2170251 by lauriii, mgifford, joshi.rohit100, lokapujya, mparker17, Mirabuck, Jalandhar: Fixed Comment headings can spit out empty heading tags.

Issue #1987424 by rteijeiro, oshelach, a-fro, JeroenT, joelpittet, Cottser, IshaDakota, InternetDevels, TommyK, Sutharsan, robmc, mark.labrecque, lokapujya, Gaelan, drupalninja99, Carolyn, jenlampton, longwave: Seven.theme - Convert theme_ functions to Twig.

Issue #2252713 by lauriii, Dragan Eror, amitgoyal: Fixed table headers inside of status reports look strange.

Issue #2017257 by jason.bell, dead_arm, alexrayu, philipz, idebr, rteijeiro, emma.maria, frankbaele, LewisNyman: Create generic layout classes.

Issue #2277661 by alexrayu, joelpittet: Fixed Labels with display:block and 'for' attribute have an invisible hit area that is accidently clicked.

Issue #1912610 by amitgoyal, BryanCGreen24, lokapujya, Rajendar Reddy, echoz, barraponto, LewisNyman, pixelwhip: Rename layout classes to follow the layout style naming convention.

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

Issue #2089331 by grom358 | thedavidmeister: [meta] Replace calls to check_plain() with Drupal\Component\Utility\String::checkPlain().

Revert "Issue #2125621 by anandps, mgifford, davidhernandez, jessebeach, mparker17: Fixed drupala11y.org finds two new color contrast issues."

Needs more discussion/review, given strong visual impact.

This reverts commit cdf25d79.

Issue #2248405 by davidhernandez, mgifford: Fixed Set Proper Contrast on the Color module's default colour scheme.

Issue #2193691 by holly.ross.drupal, Bojhan, BLadwin | mgifford: New methods, standards for describing Seven themes admin page.

Issue #2125621 by anandps, mgifford, davidhernandez, jessebeach, mparker17: Fixed drupala11y.org finds two new color contrast issues.

Issue #2266751 by cfox612, Pancho: Fixed Update and improve links styling in preview.css to mirror current values.

Issue #1920862 by martin107, Mixologic, cilefen, larowlan, xan.ps, tim.plunkett | sun: Rename custom_block.module to block_content.module.

Issue #2113911 by LewisNyman, Manuel Garcia, longwave, nod_, Rajendar Reddy, pakmanlh, olemedia, rteijeiro: Modal style update.

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

Issue #2004252 by mortendk, babruix, dasjo, joelpittet, visabhishek, cwells, jenlampton, Dragan Eror, nikhiltri, minneapolisdan, Manuel Garcia, sarahjean, acouch | scor: Node.html.twig template.

Issue #1912536 by vollepeer, derheap | taslett: Remove all references to the (removed) user-picture.html.twig file.

Issue #1989470 by LewisNyman, aboros, philipz, mgifford, rteijeiro, dimaro, Bès, klonos, emma.maria: Dropbutton style update for Seven.

Issue #2003766 by InternetDevels, KeyboardCowboy: Fixed Vertical tabs styling is pushed to the right on node edit form.

Issue #2152217 by joelpittet, mgifford, vijaycs85, jjcarrion, sun: Remove theme_form_required_marker() from the theme system - use CSS instead.