The main feature of this release is that the focus ring (i.e. the glowing outline around buttons and links) should be less prominent for mouse users. If you prefer to use the keyboard to navigate, then nothing should change. This follows a new web standard called "focus-visible."
If you prefer the old behavior, you can enable "Always show focus ring" in the settings.
Loading threads when clicking on statuses should also be faster.
@leip4Ier @meowViewer Firefox implemented an early version called -moz-focusring. I tested it out, and it's very lackluster in my opinion. (It's inconsistent, it flashes the focus ring briefly when clicking, it's based on "you pressed Tab once, now you're a keyboard user forever".)
Short answer: Mozilla and Apple both intend to implement, Chrome has implemented behind a flag and is still working on shipping. But it's part of the CSS Selectors level 4 spec. https://github.com/nolanlawson/pinafore/issues/1783#issue-620667204
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