Issue #3097907 by dww, camilledavis, Abhijith S, komalk, athyamvidyasagar, rudolfbyker, kostyashupenko, guilhermevp, shaal, andrewmacpherson, tanubansal, krishnarp, paulocs, ckrina, saschaeggi, mgifford, rkoller, mherchel: Active toolbar tray has weak affordance and fails WCAG color criteria

Issue #3351619 by Gauravvvv, longwave, Spokje, mherchel, smustgrave: Update PostCSS and postcss-preset-env for Drupal 10.1

Issue #3343212 by markconroy, andy-blum, bnjmnm, longwave, alexpott, lauriii, codexmas, harsha012, rpayanm, occupant, Mukeysh, leahtard, joelpittet: Update Core CSS to use double-colon for pseudo elements

Issue #2209063 by bnjmnm, Sam152, tarekdj, lauriii, Wim Leers, LewisNyman, quietone: Fix the flicker of the "active" icons when a high-latency user clicks on toolbar items

Issue #2878548 by alexpott, droplet, Cottser, idebr, joelpittet, xjm, martin107: Fix CSS whitespace issues

Issue #2546196 by andriyun, neclimdul, hussainweb, mgifford, Wim Leers, TR, andypost: Toolbar's orientation-toggling arrows broken by #2173527

Issue #2173527 by idflood, scresante, rpayanm, mgifford, Sam152, Wim Leers: The Menu-Toolbar area should be refactored so that Tray items are nested in the same container as their associated parent Toolbar item

Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)

Revert "Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)"

Oopsie. That was quite a bit more than I bargained for. ;)

This reverts commit 223f92b6.

Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)

Issue #2031641 by aburrows, lauriii, nlisgo, Pol, redsquid, tuutti, LewisNyman, akalata, agviu, kallehauge, _nolocation, rpayanm, saki007ster, mdrummond, RavindraSingh, brahmjeet789: Change active class to is-active

Issue #2409427 by joelpittet, SteveK, sivaramakrishnan, skippednote, idebr: Toolbar vertical orientation link not expanding to fill the space

Issue #2309137 by longwave, sqndr | LewisNyman: Remove quotes from all background-image: url() properties.

Issue #787896 by nod_, cha0s, jp.stacey, sun, David_Rothstein, Bojhan, lisarex: Add a link so that administrators can return to their most recently visited non-admin page.

Issue #1963886 by ry5n, jessebeach, dcrocks, Wim Leers: Use HiDPI icons in the toolbar to support scaling on different devices.

Issue #1938044 by hass, jessebeach, Dragan Eror: Fixed Prefix all toolbar classes to prevent theme clashes.

Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.

Issue #1137920 by jessebeach, lewisnyman, tkoleary, Bojhan, webchick, benjifisher, nod_, sjbassett, kathryn531, effulgentsia, Everett Zufelt: fixed toolbar on small screen sizes and redesign toolbar for desktop.