2026 is the year hypermedia stopped being a contrarian take. HTMX 4.0 and the ~11 KB Datastar let you build reactive UIs by shipping HTML, not 300 KB of JavaScript, and they slot neatly into a Magento + Hyvä stack.
Customize a Hyvä theme without breaking the production build: the four layers a change can live in, the Tailwind pipeline end to end, and the purge bug that bites every team exactly once.
setup:static-content:deploy compiles your theme into pub/static: CSS, JS, images, fonts and translations, per theme and locale. Here is what it builds, where it writes, and why production pages render unstyled without it.
A custom My Account tab needs a route, a controller, and a sidebar link working together, wire up only one and you get a 404. This guide builds all three on Magento 2.4.4-2.4.9 (Luma + Hyvä) and explains exactly why the 404 happens.
Generic Alpine.js docs do not tell you how to wire cart counts from PHP, why x-cloak is non-negotiable on PDP swatches, or how $dispatch lets an Alpine.js drawer talk to a Magewire form without a refresh. After shipping 40+ Hyvä modules across Magento 2.4.4-2.4.9, the same 10 patterns appear in nearly every one. This post walks through each, x-data hydrated from PHP, x-cloak flash-prevention, $store cross-component state, x-bind:class active tabs, x-on:click.outside drawers, x-intersect lazy loads, x-show transitions, x-html with DOMPurify, x-init with $watch + localStorage, and $dispatch for Magewire, with copy-pasteable snippets, when-to-reach-for-it notes, and the trap that bites first-time Hyvä devs.
Kishan Savaliya12 min read
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