HTML Head Basics
Learn how to use the HTML head element to improve your site's SEO, social sharing, and user experience.
Snippet Collections
30 seconds of code provides a wide variety of snippet and article collections for all your development needs. Explore individual language collections or browse through collections about specific topics and programming concepts.
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Collection · 6 snippets CSS Manipulation with JavaScript
Get started with manipulating CSS in the browser, using JavaScript.
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Collection · 11 snippets URLs in JavaScript
This snippet collection covers all the necessary resources to master working with URLs in JavaScript.
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Collection · 10 snippets JavaScript Proxy
The JavaScript Proxy object is a powerful tool you can use to extend the functionality of objects in a variety of interesting ways.
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Collection · 9 snippets JavaScript DOM Querying
Learn how to query the DOM quickly and efficiently with this collection of JavaScript tips and tricks.
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Collection · 5 snippets JavaScript DOM Manipulation
Create, insert, remove and manipulate DOM elements with this collection of JavaScript tips and tricks.
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Collection · 11 snippets JavaScript Event Handling
Event handling needs to be done right in JavaScript. Pick up some tips and tricks to create a better user experience.
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Collection · 4 snippets JavaScript Arrow Functions
JavaScript arrow functions are a very useful tool to learn and master. Get started with this collection of articles.
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Collection · 10 snippets JavaScript Performance Optimization
Optimize your JavaScript with this collections of tips and tricks and take your website to the next level.
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Collection · 6 snippets Colors in JavaScript
Working with color requires understanding of color formats and conversions. Luckily, this JavaScript snippet collection's got you covered.
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Collection · 9 snippets JavaScript Array Methods
Get acquainted with some common JavaScript array methods, as well as some more advanced array tricks.
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Collection · 4 snippets React Testing
Learn some of the basics of testing React components in various scenarios using React Testing Library.