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Snippet Library.

Dynamically Update CSS Variables on an Element

Learn how to use JavaScript to dynamically set and update CSS custom properties (variables) on specific DOM elements, enabling powerful runtime styling and theming without class toggles.

Collect Form Data and Show Submission Feedback

Discover how to programmatically gather all input values from a form, prevent default submission, and update a specific DOM element to provide real-time user feedback on submission status.

Create and Manage Dynamic List Items with Removal

Generate multiple list items dynamically from an array of data, append them to the DOM, and empower users to remove individual items using event listeners attached to each element.

Detect Element Visibility Using IntersectionObserver

Implement the IntersectionObserver API to efficiently check when a specific DOM element enters or exits the user's viewport, ideal for lazy loading, analytics, or animations.

Validate Flexible International Phone Numbers

Validate various international phone number formats including optional country codes, spaces, and dashes using a robust JavaScript regex pattern.

Extract All Image Source URLs from HTML

Quickly extract all `src` attribute values from `<img>` tags within an HTML string using a regular expression in JavaScript.

Extract YouTube Video ID from URLs

Easily extract the unique video ID from standard, shortened, and embed YouTube URLs using a single, versatile regular expression.

Responsive Flexbox Navbar with Space Distribution

Craft a responsive navigation bar using CSS Flexbox, distributing items evenly and vertically centering them for a clean, modern look. Adapts to smaller screens.

Responsive CSS Grid Image Gallery with Auto-Fit

Build a responsive image gallery using CSS Grid's `repeat(auto-fit, minmax())` function to automatically adjust column counts based on screen size, ensuring a fluid layout.

CSS Flexbox Sticky Footer Layout

Implement a classic sticky footer layout with CSS Flexbox, ensuring your footer always remains at the bottom of the viewport even with minimal content above it.

Full-Page Layout with CSS Grid Areas

Design a comprehensive web page layout (header, nav, main, sidebar, footer) using CSS Grid's named areas for intuitive, semantic, and maintainable structure.

Dynamically Creating and Appending a New Element

Learn how to programmatically create new HTML elements, set their attributes and text content, and append them to the DOM using vanilla JavaScript.