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CSS Syntax Patches For CSSTree 
Patch csstree syntax definitions with the latest data from CSS specifications.
Usage
npm install @csstools/css-syntax-patches-for-csstree
import { fork } from 'css-tree';
import syntax_patches from '@csstools/css-syntax-patches-for-csstree' with { type: 'json' };
const forkedLexer = fork({
atrules: syntax_patches.next.atrules,
properties: syntax_patches.next.properties,
types: syntax_patches.next.types,
}).lexer;
next
import syntax_patches from '@csstools/css-syntax-patches-for-csstree' with { type: 'json' };
console.log(syntax_patches.next);
// ^^^^
CSS specifications are often still in flux and various parts might change or disappear altogether.
Specifications also contains parts that haven't been implemented yet in a browser.
Only CSS that is widely adopted can be expected to be stable.
The next grouping contains a combination of what is currently valid in browsers and the progress in various specifications.
In the future more groupings might be added.