Issue #3492582 by tom konda, alexpott, nod_, zaryab_drupal, smustgrave: Replace some of obj && obj.prop with optional chaining

Issue #3496607 by alexpott: Make return value of stopEvent consistent and the code less tempting to change

Revert "Issue #3492582 by tom konda, zaryab_drupal, nod_, smustgrave: Replace some of obj && obj.prop with optional chaining"

This reverts commit c4c4de21.

Issue #3492582 by tom konda, zaryab_drupal, nod_, smustgrave: Replace some of obj && obj.prop with optional chaining

Issue #3031367 by bradjones1, bbrala, gabesullice, wim leers, larowlan, alexpott: Generate JSON schema for content entity types

Issue #3487449 by tom konda: Prefer to replace some of typeof obj !== 'undefined' with optional chaining

Issue #3486741 by spokje, smustgrave, markconroy: CSS linting (stylelint): npx update-browserslist-db@latest

This reverts commit 3d21bdfe.

Issue #3346707 by tedbow, phenaproxima, alexpott, catch, wim leers, dww, effulgentsia, gábor hojtsy, drumm, grasmash, chrisfromredfin, fizcs3, cola, capysara, diegors, daisyleroy, abhishek_gupta1, bnjmnm, quietone, lauriii, poker10, xjm, anish.a, ajits, traviscarden, heddn, Idoni, srishtiiee, siramsay, shabbir, rocketeerbkw, Schnitzel, s_leu, Theresa.Grannum, yash.rode, wiifm, wendyZ, tim.plunkett, Webbeh, rkoller, Ranjit1032002, kunal.sachdev, kjankowski, jayesh.d, immaculatexavier, Ishani Patel, leksat, lhridley, percoction, rahul_, p.ayekumi, omkar.podey, narendra.rajwar27, narendrar: Add Alpha level Experimental Package Manager module

Issue #3442009 by nicxvan, joachim, quietone, bhanu951, godotislate, longwave, catch, acbramley, solideogloria, mstrelan, fabianx, sun, donquixote, dawehner, benjy, claudiu.cristea, dpi: OOP hooks using attributes and event dispatcher

Issue #3213995 by groendijk, bnjmnm, gauravvvv, smovs, cindytwilliams, smustgrave, lauriii: Olivero: submit button is too wide in the off canvas dialog box

Issue #3477740 by tom konda, smustgrave: Prefer to replace all window.pageYOffset/window.pageXOffset with window.scrollY/window.scrollX

Issue #3462868 by annmarysruthy, yujiman85, nexusnovaz, pierregermain, ankitv18, sheetal-wish, smustgrave, lostcarpark, rodrigoaguilera, ultimike: Replace url usage of http://www.w3.org with https://www.w3.org in core

Issue #3464340 by herved, ahsannazir, smustgrave, longwave, nod_: JS errors from Drupal.behaviors.activeLinks (... is not a valid selector)

Issue #3303126 by phenaproxima, narendrar, thejimbirch, alexpott, aangel, Wim Leers, b_sharpe, longwave, akhil babu: Make it possible for recipes to prompt for input values

Issue #3428652 by nod_, jmaxant, alexpott, prashant.c, godotislate, UserOne.se, smustgrave: Broken auto creation of machine name field

Issue #3463108 by catch, smustgrave: Use artifacts to share the eslint and styleint caches from core to MRs

Issue #3363127 by nod_, Gábor Hojtsy, mherchel: Drupal Displace outputs invalid value for --drupal-displace-offset-right when opening top dialog