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 #2534066 by Jelle_S, Dom., attiks: Allow selecting the original image when creating a responsive image style

Issue #2348255 by Jelle_S, attiks, mdrummond, Wim Leers, giupenni, jnettik, Lukas von Blarer, SaltPacket: Provide option to use srcset and/or sizes attributes on img tag instead of the picture element

Issue #1836860 by attiks, durgesh_singh, Jelle_S, nod_, vks7056, Wim Leers: Picture doesn't work with AJAX callback

Issue #2560783 by stefan.r, joelpittet, lauriii, Cottser, Sutharsan, kgoel, justAChris, Gábor Hojtsy, dawehner, jhodgdon, effulgentsia, xjm, andypost, googletorp: Replace !placeholder with :placeholder for URLs in hook_help() implementations

Issue #2492143 by googletorp, imanol.eguskiza: Height and width is not possible to use for responsive_image element

Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error

Revert "Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error"

This reverts commit c8702065.

Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error

Issue #2334387 by mdrummond, Jelle_S, attiks, webchick, Lukas von Blarer, Bojhan: UI changes to support current responsive image standards

Issue #1364670 by mondrake, mrfelton, dinarcon, das-peter, zuuperman, er.pushpinderrana, cchanana, drupaldrop, fietserwin: ImageStyle::transformDimensions unable to deal with all effects

Issue #2483357 by googletorp, floydm, darol100, alexpott, paulmckibben: Fatal "Unsupported operand types" error when using responsive images in views

Issue #2424805 by mdrummond, YesCT, vijaycs85, xjm, marcoscano, ifrik, joelpittet, Jelle_S, attiks, lauriii: Toolbar can no longer switch horizontal and vertical -- expects breakpoints ordered from smallest to largest; responsive images need largest to smallest

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

Issue #2473105 by ifrik, jhodgdon, lostkangaroo, opratr, LinL: Update hook_help texts that link to modules that can be uninstalled

Issue #2123251 by Jelle_S, marcvangend, attiks, Sutharsan: Improve DX of responsive images; convert theme functions to new #type element

Issue #2349461 by Jelle_S, mdrummond, attiks, Wim Leers: Move fallback image style into the responsive image style entity

Issue #2457271 by rteijeiro, Palashvijay4O, Cottser: More cleanup of the 'themeable' documentation group

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

Issue #2273923 by mpdonadio, pfrenssen, effulgentsia, pcambra, xjm, tim.plunkett, martin107, cilefen: Remove html => TRUE option from l() and link generator

Issue #2260061 by Jelle_S, attiks, Wim Leers, mdrummond, mgifford, holist: Responsive image module does not support sizes/picture polyfill 2.2

Issue #2091321 by er.pushpinderrana, jhodgdon, rootwork, ifrik, mparker17: Update hook_help for Field and Field UI module

Issue #2350837 by dawehner, Berdir, larowlan, Wim Leers: Convert most usages of EntityInterface::getSystemPath() to use routes

Revert "Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator"

This reverts commit 0bcabf50.

Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator

Issue #2349859 by R. Volk, naxoc: Responsive Image Mappings :: throws a fatal exception if no image style is set