Hi everyone,
the Design System Team (DST) is proposing the following changes to
MediaWiki browser support [1]:
- Drop support for Internet Explorer 11 (IE 11)
- Drop support for all versions of Edge Legacy
- Drop support for Opera
- Increase Basic (Grade C) support for Chrome and Firefox to versions 49+,
Safari and iOS to versions 10+.

What this means: The browsers we’re phasing out won’t be tested for layout
rendering anymore. While users on these browsers might and will still be
able to read and basically interact with content, they might experience
some quirks. This step helps us integrate modern web features more

These changes will unlock the ability to use specific newer browser
features that cannot be safely used today without requiring a fallback,
notably CSS custom properties (used in upcoming reading customization
features like Night Mode) and the <summary> and <details> HTML elements
that can be used to replace the checkbox hack.
This will reduce the amount of code sent to 99.9% of users and cut down on
software development costs and maintenance burdens.

See the full announcement for more details; PDF to download [2].

On behalf of the Wikimedia Foundation Design System Team,

[1] https://www.mediawiki.org/wiki/Compatibility#Browser_support_matrix
[2] https://phabricator.wikimedia.org/F52025988
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