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HTML questions
Choose a question page, learn the concept, then test your understanding with a quiz.
How to Parse and Process HTML/XML in PHP
Learn how to parse HTML and XML in PHP, extract data safely, and choose between DOMDocument, SimpleXML, and XPath.
How to Remove Bullets from an Unordered List in CSS
Learn how to remove bullets from an unordered list using CSS, with simple examples, common mistakes, and practical usage tips.
How to Select an Element with Multiple Classes in jQuery
Learn how to select elements with multiple classes in jQuery using combined class selectors, examples, mistakes, and real use cases.
How to Set Table Cell Padding and Spacing in CSS
Learn how to replace HTML table cellpadding and cellspacing with modern CSS using padding and border-spacing.
How to Set a Default Selected Option in an HTML Select Element
Learn how to set the default selected option in an HTML select element using selected, option values, and JavaScript.
How to Store JavaScript Objects in localStorage and sessionStorage
Learn why localStorage stores strings only and how to safely save and retrieve JavaScript objects using JSON.stringify and JSON.parse.
How to Validate an Email Address in JavaScript
Learn how to validate an email address in JavaScript using simple checks, regex, and browser tools with beginner-friendly examples.
How to Vertically Center Text with CSS
Learn how to vertically center text with CSS using flexbox, line-height, and other practical techniques for modern layouts.
JavaScript Links: Should You Use href="#" or javascript:void(0)?
Learn why href="#" and javascript:void(0) are usually poor choices, and what to use instead for JavaScript actions.
Matching Opening HTML Tags with Regex in JavaScript
Learn how to match opening HTML tags while excluding self-closing tags, and understand the limits of regex for HTML parsing.
Why Browsers Treat Invalid HTML Colors Like “chucknorris” as a Color
Learn why invalid HTML color values like “chucknorris” still produce colors, and how browsers parse legacy color attributes.
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