Issue #3358336 by kim.pepper, rpayanm, andypost, longwave, smustgrave, Wim Leers, catch: Deprecate _drupal_flush_css_js() and create a new AssetQueryString cache service

Issue #3328454 by xjm, Bhanu951, jidrone, smustgrave: Replace most strpos() !== FALSE or === FALSE with str_contains()

Issue #2669074 by kim.pepper, Berdir, gaydabura, andypost, ravi.shankar, KapilV, Wim Leers, bradjones1, nickolaj, alexpott, mondrake, 20th, yogeshmpawar, gaurav.kapoor, voleger, Pavan B S, Neslee Canil Pinto, aerozeppelin, Cameron Tod, daffie, dhruveshdtripathi, abramm, Nono95230, s.messaris, Mile23, claudiu.cristea, larowlan, catch, jibran, SpadXIII: Convert file_create_url() & file_url_transform_relative() to service, deprecate it

Issue #2716115 by LittleCoding, gnuget, jungle, gapple, tatarbj, sandeep_jangra, erlendoos, markcarver, NickDickinsonWilde, cayriawill, catch, geek-merlin: Allow attributes passed with CSS in libraries (SRI)

Issue #2888723 by fenstrat, Petr Illek, kim.pepper, johnennew, Wim Leers, alexpott: ckeditor_stylesheets cache busting: use system.css_js_query_string

Issue #2897408 by cburschka, gapple, xjm, effulgentsia: Remove IE9 support from CssCollectionRenderer and provide it in contrib instead

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #1494670 by Liam Morland, jhedstrom, Wim Leers, mfb: References to CSS, JS, and similar files should be root-relative URLs: avoids mixed content warnings & fewer bytes to send

Issue #2557519 by alexpott, joelpittet: Remove many usages SafeMarkup::checkPlain() and replace with Html::escape()

Issue #977844 by Wim Leers: Remove the 'every_page' option for CSS/JS assets: it is confusing, even damaging

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2368797 by Wim Leers, dawehner, rteijeiro: Optimize ajaxPageState to keep Drupal 8 sites fast on high-latency networks, prevent CSS/JS aggregation from taking down sites and use HTTP GET for AJAX requests

Issue #1786490 by Berdir, amateescu, damiankloip, Wim Leers, dawehner: Add caching to the state system.

Revert "Issue #1786490 by Berdir, amateescu, damiankloip, dawehner: Add caching to the state system."

This reverts commit 8ec847cc.

Issue #1798738 by alexpott, mtift, tayzlor, ianmthomasuk, Albert Volkman, heyrocker, cam8001: Move css_js_query_string() to state system.

Issue #352951 by Wim Leers, mfer, mcjim, larowlan, RobLoach, sdboyer, Owen Barton, JohnAlbin: Make JS & CSS Preprocessing Pluggable.