Issue #3426514 by magaki, Tom Konda, longwave: Drupal.theme.progressBar() does not escape output correctly

Issue #3416898 by Tom Konda, Tirupati_Singh: Use String.prototype.includes() instead of String.prototype.indexOf() where necessary

Issue #3238308 by mstrelan, bnjmnm, nod_, smustgrave, larowlan, rikki_iki: Refactor (if feasible) uses of the jQuery css function to use Vanilla/native

Issue #3278415 by nod_, lauriii, catch, Wim Leers, longwave, xjm, claudiu.cristea: Remove usages of the JavaScript ES6 build step, the build step itself, and associated dev dependencies

Issue #3253148 by mherchel, longwave, ckrina, droplet: Remove IE from core's browserlist, remove non-essential CSS importing and recompile assets

Issue #3101543 by lauriii, bnjmnm, ravi.shankar, alexpott: Update core JavaScript dependencies listed in package.json

Revert "Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json"

This reverts commit 2dadb738.

Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json

Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

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

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #2000558 by pwolanin, nod_, dawehner: Regrression: Progress bar creates doesn't stop on errors.

Issue #1606362 by nod_, Angry Dan, seutje: Use throw when an ajax error occurs and extend JavaScript's Error object.

Issue #1419968 by nod_, cosmicdreams, droplet, tim.plunkett: Replace $('selector', domelement) with $(domelement).find('selector').

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #906922 by auzigog: error message icon is tiled for when the message appears on a batch page in place of a progress bar.

#513946 by Everett Zufelt and mgifford: Enhance accessibility of progress bar by adding an ARIA live region.

#544418 by merlinofchaos, sun, drewish, quicksketch, et al: Integrate CTools AJAX framework with Drupal to extend (and replace) existing ahah framework. Everything about AJAX/AHAH is more betterer now.

#125030 by kkaefer, quicksketch, dvessel, Steven, and John Resig: Allow compatibility with other JavaScript libraries.

#201141 by yched: instead of 'HTTP error 200' messages when a PHP error occurs, actually display the PHP error message

#184867 by deekayen, catch and keith.smith: fix some spelling errors in our source code and messages printed