Frontend + AI internals
Deep technical breakdowns for engineers who want the mechanics, tradeoffs, and weird browser or AI behavior beneath the abstraction.
Technical breakdowns
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New posts and selected archive entries from the canonical Under The Hood home.
Angular
Ever wonder why updating a signal sometimes feels like magic — and other times like it just won’t trigger a component update? This article walks through how Angular Signals work under the hood, from dependency tracking to change detection, told through concrete debugging moments.
Angular
Explore the new Angular standalone components feature, how Angular’s compiler handles them differently, how dependency injection scopes change, and the implications for large-scale app architecture and debugging.
CSS
Explore the CSS cascade with practical examples and SCSS nuances, including how cascade layers, specificity, importance, and source order interact. Learn to debug tricky style conflicts and how SCSS-generated CSS affects cascade outcomes.
Angular
Unpack the Angular Signals reactivity model, how signals track dependencies, how they interact with Angular’s change detection, and debugging strategies for reactive state bugs in production apps.
Accessibility
Explore patterns and internal mechanisms design systems use to ensure accessible focus management across components, how they integrate with ARIA, and debugging mismatches between system defaults and app overrides.
React
Explore how React’s useTransition hook works under the hood to defer state updates, how it interacts with concurrent rendering, and when to use it for optimal user experience and performance.