Questions
HTML questions
Choose a question page, learn the concept, then test your understanding with a quiz.
Add a Favicon to a Static HTML Page
Learn how to add a favicon to static HTML pages, use correct paths and icon formats, and troubleshoot browser caching and local-file issues.
Allow Only Numeric Input (0-9) in HTML Input Using jQuery
Learn how to allow only digits 0-9 in an HTML input using jQuery, with examples, validation tips, common mistakes, and best practices.
Apply CSS !important with jQuery .css()
Learn why jQuery .css() cannot set !important and how to use CSSStyleDeclaration.setProperty() to apply inline important styles safely.
Bootstrap 3 sr-only Class: Screen Reader Accessibility
Learn how Bootstrap 3's sr-only class adds screen-reader labels to icon-only controls without changing the visible page layout.
CSS ::before and ::after on Input Elements
Learn why CSS ::before and ::after usually do not work on input elements, what replaced elements are, and practical alternatives.
CSS :not() Selector for Excluding a Class or Attribute
Learn how to use the CSS :not() selector to target elements that do not have a specific class or attribute, with examples and common mistakes.
CSS Absolute Positioning Relative to a Parent Element
Learn how to position absolute child elements relative to a parent with CSS using position: relative, offsets, and practical examples.
CSS Background Opacity Without Fading Text
Learn why CSS opacity affects an entire element and how to create transparent backgrounds while keeping text and child content fully visible.
CSS Space Between Table Rows: border-spacing Explained
Learn how to add vertical space between HTML table rows with CSS border-spacing, border-collapse, and alternatives for reliable table layouts.
Can HTML Checkboxes Be Readonly? Understanding readonly vs disabled in HTML Forms
Learn why HTML checkboxes do not support readonly, how disabled differs, and practical ways to prevent changes while still submitting values.
Can You Change `input type="date"` Format in HTML?
Learn how HTML date inputs format values, why you cannot force DD-MM-YYYY, and how to display custom date formats safely.
Can You Style Half a Character in CSS? Text Effects with CSS and JavaScript
Learn how to style half of a character using CSS and JavaScript, including overlay techniques for dynamic text effects.
Center Text Horizontally and Vertically in a Div with CSS
Learn how to center text inside a div horizontally and vertically using modern CSS Flexbox, Grid, and practical alternatives.
Center a DIV on Screen with jQuery and CSS
Learn how to center a div in the browser viewport with CSS and jQuery, including responsive resizing and common layout mistakes.
Check If a Checkbox Is Checked with jQuery
Learn how to check whether a checkbox is checked in jQuery using the correct selector, with examples, mistakes, and practical patterns.
Convert HTML and CSS to PDF in PHP: Options, Limits, and Practical Approaches
Learn how HTML-to-PDF conversion works in PHP, why CSS support varies, and how to choose a practical approach for Linux web servers.
Difference Between <section> and <div> in HTML
Learn the difference between HTML <section> and <div>, when to use each, and how semantic HTML improves structure and accessibility.
Disable Links with CSS: pointer-events and Accessible Alternatives
Learn how CSS pointer-events can block mouse clicks on links, why it does not truly disable anchors, and accessible navigation alternatives.
Display HTML Styled Text in an Android TextView
Learn how to render supported HTML formatting in an Android TextView using HtmlCompat, including examples, limits, and safe practices.
Embedding SVG with img, object, and embed in HTML
Learn when to use img, object, or embed for SVG files, including MIME types, fallbacks, accessibility, and practical HTML examples.
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