Issue #1390580 by mohit_aghera, heliogabal, Chernous_dn, andrewmacpherson, mgifford, droplet, Everett Zufelt: Add comments for skip link and main-content anchor in templates

Issue #2538950 by alexpott, dawehner, stefan.r: Replace SafeMarkup::format() in template_preprocess_html with placeholders in the template

Issue #2542392 by andypost, gtrost, sdstyles, prabhurajn654, jhodgdon, joelpittet, Wim Leers: Document scripts_bottom template variable

Issue #2369987 by aneek, alexpott, joelpittet, rteijeiro, pgautam, jain_deepak, idebr: Remove SafeMarkup::set() from 'head' title on template_preprocess_html

Revert "Issue #2369987 by aneek, joelpittet, rteijeiro, jain_deepak, pgautam, idebr: Remove SafeMarkup::set() from 'head' title on template_preprocess_html"

This reverts commit 10c8777e.

Issue #2369987 by aneek, joelpittet, rteijeiro, jain_deepak, pgautam, idebr: Remove SafeMarkup::set() from 'head' title on template_preprocess_html

Issue #2407565 by epari.siva, davidhernandez, akalata, pakmanlh, lauriii, vedpareek, Cottser, brianperry: Consensus Banana Phase 1, cleanup

Issue #2407729 by sivaji@knackforge.com, mortendk: Remove classes from system templates h*.html.twig

Issue #2329753 by lauriii, davidhernandez, LewisNyman, nathandao: Move html classes from preprocess to templates

Issue #1982256 by mortendk, rteijeiro, tim.plunkett, LewisNyman, tlattimore, yannickoo, ry5n: Clean up html.html.twig markup.

Issue #1843650 by Mark Carver, jenlampton, Cottser: Remove the process layer (hook_process() and hook_process_HOOK).

Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files

Issue #1363112 by mparker17, mgifford, tlattimore, Jacine, dcmouyard, bowersox, ry5n, ahdiaz: Simplify names of 'element-x' helper classes.

Issue #1961872 by Cottser, widukind, foopang, shanethehat, nikkubhai, c4rl, thedavidmeister: Convert html.tpl.php to Twig.