This update applies the following changes:
- Improve menu UI to support keyboard, click and touch interactions
- Improve variable scoping and js performance in menu interaction javascript
- Improve custom-colors for selected text, buttons and menu hover styles
- Improve margins structure for more consistency between editor and frontend
- Improve discussion avatars for simpler wording and better performance
- Improve fonts in list widgets and list blocks
- Improve comment responsive spacing and avatar display
- Improve various block styles to make them consistent between the editor and frontend
- Add tabbed browsing support for ie11
- Add backwards compatibility support for older versions of WordPress
- Add fallback styles for older versions of WP where Gutenberg is activated and then deactivated (backwards compatibility)
- Add `sizes` attribute for featured images to improve responsive performance
- Add focus-within polyfill
- Add a footer menu for secondary page links
- Fix editor styles to prevent conflicts with plugins that add meta boxes to the editor
- Fix columns block issues on small screens
- Fix empty-space font text cursor issue in Gutenberg editor
- Fix RTL floating styles so that left/right floats are honored
- Fix cover image block margins/padding
- Fix invalid rgba style
- Fix php warning when returning attributes
- Fix gallery widget margins to improve gallery grids
- Fix .entry-content selectors to prevent shortcodes, plugins and other unknown content from breaking the layout
- Remove translation escaping to follow code standards in previous default themes
- Remove custom color output in the fronten header when default color is selected
- Remove fly-out sub-sub-sub-menu behavior on desktop to prevent sub-menus from falling off the screen
- General code clean up and coding standards improvements
Initial development occurred on GitHub. See: https://github.com/WordPress/twentynineteen
Props allancole, karmatosed, kjellr, yingling017, mrasharirfan, milana_cap, fabiankaegy, westonruter, aaronjorbin, netweb, b-07, khleomix, blowery, dereksmart, jasmussen, audrasjb, nielslange, mmaumio, dimadin, joyously, anevins12, peterwilsoncc, dannycooper, icaleb, siriokun, technosiren, travel_girl, azchughtai, ianbelanger, nadim1992, ismailelkorchi, nativeinside, chetan200891, icaleb, grapplerulrich, ocean90, joshfeck, frankew, abdulwahab610, mendezcode, eliorivero, melchoyce, joen, laurelfulford, mdawaffe, kraftbj, dsmart, mukeshpanchal27, burhandodhy, crunnells, Ismail-elkorchi, aryaprakasa, @tlxo, @themeroots, @whizbangik, @yingles, @youthkee, @brentswisher, @smy315, @ahmadawais, @desi-developer.
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