Questions
HTML questions
Choose a question page, learn the concept, then test your understanding with a quiz.
How to Enable and Disable a Submit Button with jQuery
Learn how to enable and disable a submit button in jQuery based on text input value, with examples, mistakes, and practical patterns.
How to Fix "An invalid form control with name='' is not focusable" in HTML Forms and ASP.NET Web Forms
Learn why Chrome shows "An invalid form control is not focusable" and how to fix hidden invalid fields in HTML forms and ASP.NET Web Forms.
How to Get Input Text Box Values with jQuery
Learn how to read and display input field values with jQuery using val(), events, and practical examples for beginners.
How to Get a data-id Attribute in jQuery
Learn how to read a data-id attribute in jQuery using .attr() and .data(), including click handlers, event binding, and common mistakes.
How to Get an HTML Element’s Width and Height in JavaScript
Learn how to measure an HTML element’s width and height in JavaScript using offsetWidth, clientWidth, getBoundingClientRect, and more.
How to Get the Selected Option from a Dropdown in jQuery
Learn how to get the selected dropdown value or text in jQuery, why .val() works, and common mistakes with select elements.
How to Get the X and Y Position of an HTML Element in JavaScript
Learn how to get an element's X and Y position in JavaScript using getBoundingClientRect, offsets, and scroll-aware approaches.
How to Handle :hover in Inline CSS for HTML and Email
Learn why :hover cannot be written in inline CSS, how CSS pseudo-classes work, and practical alternatives for HTML and email styling.
How to Hide HTML5 Number Input Spin Buttons with CSS
Learn how to hide number input spin buttons using CSS, browser-specific rules, and practical form styling tips for HTML5 inputs.
How to Hide the Scrollbar While Keeping Scrolling in CSS
Learn how to hide scrollbars while preserving scrolling using CSS in Chrome, Firefox, and older Edge/IE browsers.
How to Horizontally Center a div in CSS
Learn how to horizontally center a div in CSS using margin auto, flexbox, and other common layout techniques with simple examples.
How to Maintain a Div Aspect Ratio with CSS
Learn how to keep a div responsive while preserving its aspect ratio using pure CSS, with modern and fallback techniques.
How to Make Only the Background Transparent in CSS
Learn how to make a CSS background semi-transparent without affecting text or images using RGBA, pseudo-elements, and modern CSS patterns.
How to Make a Div Fill Remaining Height in CSS
Learn how to make a content div fill the remaining screen height below a variable-height header using modern CSS layouts.
How to Make a Div Fill the Browser Height in CSS
Learn how to make a div fill 100% of the browser window using CSS with height, min-height, and viewport units.
How to Make a div Fit Its Contents in CSS
Learn how to make a div only as wide as its content using CSS display rules, shrink-to-fit behavior, and practical layout examples.
How to Make an HTML Button Act Like a Link
Learn the accessible way to make an HTML button act like a link in HTML, including when to use links vs buttons and common mistakes.
How to Make the Body Fill the Full Browser Height in CSS
Learn how to make the HTML body fill the full browser height in CSS and avoid white space at the bottom of short pages.
How to Modify the URL Without Reloading the Page in JavaScript
Learn how to change the browser URL without reloading the page using JavaScript History API and hash updates.
How to Move a DOM Element Into Another Element in JavaScript
Learn how to move a DIV into another element in JavaScript using DOM methods like appendChild and append.