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Step-by-step programming tutorials on PHP, JavaScript, Laravel, WordPress and more.

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CSS Intermediate

Container Queries: Components That Fit Their Container, Not the Screen

A card in a sidebar and the same card full-width need different layouts - media queries cannot tell them apart. Container queries finally let components respond to their own space.

Jul 28, 2025 2 min 1,756

JavaScript Intermediate

ResizeObserver: Components That Respond to Their Own Size

Window resize listeners cannot see a sidebar collapsing or a panel being dragged wider. ResizeObserver watches the element itself - the JS half of container-based design.

Mar 16, 2025 2 min 542

CSS Intermediate

Fluid Typography with One Line of clamp()

Stop writing a font-size media query for every breakpoint. clamp() scales type smoothly with the viewport between a floor and a ceiling you control.

Jul 5, 2024 2 min 4,456

JavaScript Intermediate

Responsive JavaScript Without Resize Listeners

Checking window.innerWidth on every resize event is wasteful and drifts out of sync with your CSS. matchMedia gives JavaScript the same breakpoints CSS uses, with change events.

May 3, 2024 2 min 4,822

Carl Victor Fontanos

Container Queries: Components That Fit Their Container, Not the Screen

ResizeObserver: Components That Respond to Their Own Size

Fluid Typography with One Line of clamp()

Responsive JavaScript Without Resize Listeners