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Frontend

96 articles on Frontend — each with a runnable playground and a quiz.

Articles

JavaScript

Five tabs open, one refresh token — the race nobody noticed

Aug 15 · 5 min JavaScript

You copy and reverse the array to find the last match. findLast() searches from the end directly.

Aug 14 · 4 min JavaScript

Your fetch() in beforeunload is being silently dropped. Use navigator.sendBeacon().

Aug 13 · 5 min CSS

You're blocking touchmove events to contain scroll. overscroll-behavior does it natively.

Aug 12 · 4 min JavaScript

You're polling setInterval to detect DOM changes. MutationObserver fires when they happen.

Aug 11 · 4 min JavaScript

You're importing pako to gzip data. CompressionStream does it natively.

Aug 10 · 4 min JavaScript

Stop using the localStorage hack to sync browser tabs. BroadcastChannel does it natively.

Aug 9 · 4 min HTML

You built your modal with a <div> and a focus trap library. The native <dialog> does all of that.

Aug 8 · 5 min JavaScript

Stop importing uuid. crypto.randomUUID() has been native since 2021.

Aug 8 · 4 min JavaScript

You're installing date-fns for 'X hours ago'. Intl.RelativeTimeFormat does it natively.

Aug 7 · 4 min JavaScript

You use obj.hasOwnProperty(key) to check property ownership. It can silently fail. Object.hasOwn() is the safe replacement.

Aug 6 · 4 min CSS

Container queries can check more than size — style queries let components read custom property values

Aug 6 · 4 min
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webdev 174javascript 141tutorial 71css 51performance 30typescript 25react 20programming 19browser 18node 16html 12nextjs 11