Issue #2569069 by stefan.r, mr.baileys, alexpott, lauriii: Replace TranslationWrapper with TranslatableString and deprecate TranslationWrapper

Issue #2557113 by stefan.r, alexpott, dawehner, joelpittet, cilefen, lauriii, plach, catch, chx, xjm: Make t() return a TranslationWrapper object to remove reliance on a static, unpredictable safe list

Issue #2477223 by Mile23, Wim Leers, j2r, ianthomas_uk, jaimeguzman, pjbaert: Refactor _drupal_add_html_head, drupal_get_html_head, _drupal_add_html_head_link into the attachments processor, remove from common.inc

Issue #2552865 by Mile23: Deprecate drupal_process_attached() for 8.0.0 and either throw an Exception or make it work via the RenderContext

Issue #2452475 by lhangea, googletorp, arpitr, neetu morwani, ianthomas_uk, Mile23: Remove deprecated function drupal_merge_attached() and its references

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 #2221771 by ianthomas_uk, rpayanm, Eli-T, Rolf van de Krol, pjonckiere, xjm, DuaelFr: Mark all simple wrappers in bootstrap.inc and common.inc as deprecated

Issue #2467759 by Mile23, andypost, Wim Leers, Berdir, Fabianx, Crell: Refactor drupal_process_attached() so it doesn't depend on drupal_add_http_header()

Issue #2501455 by Cottser, alexpott, akalata: Remove SafeMarkup::set() in drupal_render_children() and replace it with SafeString

Issue #2493665 by Fabianx, dawehner, msonnabaum, catch: Add centralized container invalidation method

Issue #2487600 by dawehner, Wim Leers, fgm: #access should support AccessResultInterface objects or better has to always use it

Issue #2511472 by Wim Leers, Fabianx, dawehner: Refactor all usages of drupal_render()/Renderer::render() that break #2450993

Issue #2499943 by mikey_p, Berdir, catch: system.active_theme.THEMENAME state should not cache theme data

Issue #2451395 by dawehner, catch, fgm, David_Rothstein: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them

Issue #2483433 by damiankloip, Wim Leers, catch, dawehner: Optimize CacheableMetadata::merge() + BubbleableMetadata::merge()

Issue #2478483 by Wim Leers, Fabianx: Introduce placeholders (#lazy_builder) to replace #post_render_cache

Issue #2429443 by vijaycs85, rteijeiro, penyaskito, gloob, xjm, nod_, geertvd, pjonckiere, alexpott, Wim Leers, Gábor Hojtsy, Fabianx, tim.plunkett: Date format form is unusable

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

Issue #2471216 by joshi.rohit100, PieterJanPut, Wim Leers: render() should call the renderer service directly

Revert "Issue #2451395 by dawehner: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them"

This reverts commit db8fa578.

Issue #2226621 by JeroenT, ianthomas_uk, lokapujya, pjonckiere, marcingy, LinL, Xano, rpayanm, piyuesh23: Remove usage of element_info(), element_child() and element_children(). Deprecate element_info_property()

Issue #2451395 by dawehner: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them

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

Issue #2378883 by Wim Leers, dawehner: Convert existing drupal_render() KernelTestBase tests to PHPUnit tests

Issue #2417645 by tim.plunkett, effulgentsia, pwolanin: Change destination query string handling to break dependence on system path

Issue #2343043 by cilefen, hussainweb: valid_email_address() should use egulias/EmailValidator and become deprecated