How I Graduated from React to Vanilla JavaScript
summary
Shows how a cross-framework accessible design system (Skylab) is implemented in vanilla JavaScript using the custom elements API with an IE polyfill, and reports concrete wins and bugs: a document.body event listener causing a repeating memory leak when components re-render, an appendChild timing mismatch fixed to work with Svelte, and a date picker implementing ARIA keyboard rules like arrow keys and a month/year picker (date picker keyboard behavior). Also describes building a React wrapper to keep custom elements compatible with Ember, React, Vue and soon Angular.
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