Tutorials

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JavaScript Beginner

The One-Line Browser Trick That Makes Any Page Editable

Type document.designMode = "on" in the console and the entire page becomes editable like a document. Absurdly useful for copy reviews, screenshots and layout testing.

Mar 12, 2024 2 min 5,234 Read →

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JavaScript Intermediate

Let Users Paste Screenshots Straight into Your App

Ctrl+V with an image on the clipboard fires a paste event carrying a real File object. Ten lines of code turn any form into a screenshot-friendly uploader.

Apr 12, 2024 2 min 5,064 Read →

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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 4,893 Read →

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CSS Intermediate

:has() Is the Parent Selector We Waited Twenty Years For

Style a form field wrapper based on the input inside it, a card based on whether it has an image, a layout based on its content - all in pure CSS with :has().

May 28, 2024 2 min 4,732 Read →

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CSS Intermediate

CSS-Only Carousels with scroll-snap

A swipeable, momentum-friendly, accessible carousel needs no JavaScript at all. scroll-snap turns a plain overflow container into one, and it feels native because it is.

Jun 10, 2024 2 min 4,624 Read →

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JavaScript Intermediate

Why Your Analytics Miss Closing Tabs (and How sendBeacon Fixes It)

fetch() calls fired when a user closes the tab often never leave the browser. navigator.sendBeacon() exists precisely for this moment, and it is a one-line change.

Feb 5, 2024 2 min 4,544 Read →

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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 4,515 Read →

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CSS Beginner

The Pseudo-Elements Everyone Forgets: ::marker and ::selection

List bullets and text-highlight colors are both fully styleable with dedicated pseudo-elements - no list-style: none rebuilds, no browser defaults clashing with your brand.

Aug 15, 2024 2 min 4,276 Read →

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JavaScript Advanced

Do the Boring Work When the Browser Is Bored: requestIdleCallback

Analytics batching, prefetching, cache warming - none of it should compete with user interaction. requestIdleCallback runs your low-priority work in the gaps.

Apr 6, 2024 2 min 4,223 Read →

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CSS Beginner

Theme Every Checkbox and Radio with One CSS Line

Custom checkbox hacks - hidden inputs, pseudo-element ticks, sprite images - solved a problem that accent-color now handles in a single declaration.

Jun 5, 2024 2 min 3,887 Read →

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CSS Beginner

:focus-visible Ends the outline: none Wars

Designers hate focus rings on click, keyboard users need them to navigate at all. :focus-visible gives each group what they want - and browsers already use it by default.

Jun 27, 2024 2 min 3,782 Read →

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JavaScript Beginner

Object.groupBy() Ends a Decade of reduce() Boilerplate

Grouping an array of objects used to mean writing the same reduce() dance in every project. JavaScript finally does it natively, and the syntax is one line.

Jan 9, 2024 2 min 3,780 Read →