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 #2991686 by smustgrave, larowlan, Grayle: Enabling "Edit" to show all contextual links breaks tabbing in edit forms in the backend

Issue #2738547 by smustgrave, mehul.gada, sahil.goyal, larowlan, BarisW, xjm: Contextual Links do not respect parameters in the destination

Issue #2894269 by droplet, Akram Khan, _pratik_, dylf, nod_, Cottser: `bool` in JSDoc should be `boolean`

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 #2168711 by yogeshmpawar, droplet, mariancalinro, bnjmnm, peterpoe, lauriii, Kgaut, nod_, benjifisher:  Modernizr.touchevents use can lead to scenarios that break contextual links

Issue #3239123 by hooroomoo, bnjmnm, nod_: Refactor (if feasible) uses of the jQuery text function to use vanillaJS

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

Issue #3174884 by raman.b, alexpott, lauriii, zrpnr, nod_: Update yarn dependencies for Drupal 9.1.0

Issue #2891603 by eiriksm, alexpott, charlietoleary, Grayle, drclaw, fgm: Contextual links can't handle multiple occurrences of the same contextual links (again)

Issue #3126957 by Suresh Prabhu Parkala, Neslee Canil Pinto, Kristen Pol, jungle: Add missing curly brackets around @inheritdoc

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 #2873389 by mgifford, andrewmacpherson, RachelOlivero, mradcliffe: ARIA role="form" on contextual menu buttons is unnecessarily verbose and misleading for screen readers

Issue #2707879 by hctom, Sam152, grahl, reekris, casey, gngn, Noemi, dawehner, jherencia: Contextual Links do not respect pathPrefix

SA-CORE-2018-006 by alexpott, attilatilman, bkosborne, catch, bonus, Wim Leers, Sam152, Berdir, Damien Tournoud, Dave Reid, Kova101, David_Rothstein, dawehner, dsnopek, samuel.mortenson, stefan.r, tedbow, xjm, timmillwood, pwolanin, njbooher, dyates, effulgentsia, klausi, mlhess, larowlan

Issue #2829185 by vaplas, Jo Fitzgerald, anmolgoyal74, chipway, gaurav.kapoor, mark_fullmer, amit.drupal, cilefen, longwave, xjm, wturrell, anavarre: Fix spelling errors in Drupal core comments

Issue #2981652 by ApacheEx, corbacho, drpal, dawehner, xjm, alexpott, lauriii: Format core JavaScript using recently add Prettier

Issue #2919147 by tedbow, tim.plunkett: When edit mode is enabled new page loads will not have Contextual tabbing constrained

This reverts commit 169e8671.

Issue #2764931 by tedbow, tim.plunkett, nod_, drpal, droplet, dawehner, Wim Leers, phenaproxima: Contextual links don't work with 'use-ajax' links

Issue #2551373 by drpal, danlinn, ruthleopold, Berdir, droplet, Wim Leers, prajaankit: contextual.js and quickedit.js should fail gracefully, with useful error messages, when Twig templates forget to print attributes

Issue #2863222 by dmsmidt, tedbow, drpal, tim.plunkett: Contextual Accessibility: Announcement broken after enabling editing mode a second time

Issue #2650910 by drpal, Anishnirmal, markdorison, Tom Robert, psend, yannickoo, rachel_norfolk, Wim Leers, droplet: Contextual links button is always rendered even when no links are available (with warm client-side cache)

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