Hidden Features

42 tutorials

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

All Hidden Features 42 JavaScript 55 Tips & Tricks 50 CSS 40 PHP 37 UX 36 Performance 22 Debugging 19 Browser APIs 18 DOM 14 AJAX 12 Forms 11 Security 10 jQuery 8 Animations 7 HTML 2

Latest Popular

JavaScript Advanced

Tagged Template Literals: The Feature Behind Every html`` You've Seen

That html`...` syntax in lit and friends is not magic - it is a plain JavaScript feature you can use to build an XSS-safe HTML helper in fifteen lines.

May 16, 2024 2 min 2,453

JavaScript Beginner

The <dialog> Element Probably Replaces Your Modal Library

Focus trapping, Escape to close, a backdrop, top-layer stacking above every z-index - the native dialog element does all of it with zero JavaScript dependencies.

Apr 16, 2024 2 min 876

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 5,210

JavaScript Beginner

Yes, JavaScript Has Labels (and They Fix Nested Loop Escapes)

Breaking out of two loops at once usually means ugly flag variables or refactoring into functions. JavaScript has had a cleaner answer since day one: labeled statements.

Feb 24, 2024 2 min 1,850

JavaScript Beginner

structuredClone() Finally Kills the JSON.parse(JSON.stringify()) Hack

The old JSON round-trip for deep copies silently destroys Dates, Maps, Sets and circular references. structuredClone() handles all of them, and it is built into every modern browser.

Jan 17, 2024 2 min 2,813

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 3,762