What does HTML stand for

• HyperText Markup Language.

Which HTML tag is used for the main heading of a page

• h1.

Which tag is used to create a hyperlink

• a.

How do you include an external CSS file in HTML

• link rel="stylesheet" href="styles.css".

Which HTML attribute specifies alternative text for an image

• alt.

Which tag is used to create an unordered list

• ul.

What does CSS stand for

• Cascading Style Sheets.

Which property controls the text color in CSS

• color.

How do you select an element with id "main" in CSS

• #main.

How do you select elements with class "btn" in CSS

• .btn.

Which CSS property is used to change the font size

• font-size.

Which CSS property controls the space between an element's border and its content

• padding.

Which CSS property controls the space outside an element's border

• margin.

What is the default display value of a div element

• block.

Which CSS property changes the background color of an element

• background-color.

Which HTML element is used to embed JavaScript code

• script.

How do you write a comment in JavaScript

• // comment.

Which method prints a message to the browser console

• console.log().

How do you declare a variable that cannot be reassigned in JavaScript

• const.

Which keyword declares a block-scoped variable in JavaScript

• let.

What is the result of typeof [] in JavaScript

• object.

Which method converts a JavaScript object to a JSON string

• JSON.stringify().

Which method parses a JSON string into a JavaScript object

• JSON.parse().

What does DOM stand for

• Document Object Model.

Which method selects the first element that matches a CSS selector

• document.querySelector().

Which method selects an element by its id

• document.getElementById().

How do you add a CSS class "active" to an element in JavaScript

• element.classList.add('active').

Which event fires when the user clicks an element

• click.

How do you prevent the default action of an event in JavaScript

• event.preventDefault().

Which attribute loads a script without blocking HTML parsing but executes it as soon as it's ready

• async.

Which attribute ensures a script executes after the HTML is parsed

• defer.

What does CSS box-sizing: border-box do

• Includes padding and border in the element's total width and height.

Which CSS property is used for flexible box layout

• display: flex.

Which CSS property aligns items along the main axis in flexbox

• justify-content.

Which CSS property aligns items along the cross axis in flexbox

• align-items.

What CSS property defines a grid container

• display: grid.

Which unit is relative to the root element's font size

• rem.

Which CSS pseudo-class represents an element when a user mouses over it

• :hover.

Which CSS pseudo-element inserts content before an element's content

• ::before.

Which property makes an element invisible but still takes up space

• visibility: hidden.

Which property makes an element not appear and not take any space

• display: none.

What does the CSS z-index property control

• Stacking order along the z-axis.

Which HTML5 element is used for scalable vector graphics

• svg.

Which input type provides a date picker in supporting browsers

• type="date".

How do you make an element focusable for accessibility

• Add tabindex="0".

Which HTML meta tag sets the character encoding

• meta charset="utf-8".

Which JavaScript operator is used for strict equality comparison

• ===.

What does hoisting in JavaScript refer to

• Declarations being moved to the top of their scope at runtime.

Which method adds an element as the last child of a parent node

• parent.appendChild(child).

What is event delegation

• Using a single handler on a parent to manage events for its children.

Which keyword creates a class in JavaScript

• class.

Which method removes an element from the DOM

• element.remove().

What does CSS specificity determine

• Which CSS rule applies when multiple rules target the same element.

Which property smoothly changes property values over time in CSS

• transition.

Which property creates keyframe-based animations in CSS

• animation.

Which HTML attribute is used to store custom data on elements

• data-* attributes.

How do you comment in CSS

• /* comment */.

Which JavaScript feature allows asynchronous code written like synchronous code using async/await

• Promises with async/await.

What does the fetch() function return

• A Promise.

Which HTTP method is commonly used to retrieve data

• GET.

Which HTML element is used to create a form

• form.

Which input attribute makes a field required before submitting a form

• required.

Which attribute specifies where to open the linked document for an a tag

• target.

What does the CSS property object-fit control

• How replaced content like images fit within their container.

Which JavaScript array method creates a new array with results of calling a function on every element

• map().

Which array method creates a new array with elements that pass a test

• filter().

Which array method reduces array to a single value

• reduce().

What do CSS media queries help with

• Applying styles based on device characteristics like width.

Which property makes text unselectable by user

• user-select: none.

Which HTML element defines the document's title shown in browser tab

• title.

Which tag is used to include inline SVG code

• svg.

Which HTML attribute specifies the URL of an image

• src.

Which CSS function calculates values using expressions

• calc().

Which CSS variable syntax defines a custom property

• --var-name: value;

How do you use a CSS custom property in a rule

• var(--var-name).

Which HTML element is used to embed a video

• video.

Which attribute on video enables native controls

• controls.

Which JavaScript statement handles runtime errors

• try...catch.

Which method stops event propagation to parent elements

• event.stopPropagation().

Which property sets the font family in CSS

• font-family.

Which unit is relative to the viewport height

• vh.

What does the HTML5 canvas element provide

• A drawable region for graphics via script.

Which attribute on input masks user input for passwords

• type="password".

Which HTTP status code indicates success

• 200.

Which status code indicates a resource was not found

• 404.

Which meta tag helps responsive design by controlling viewport

• meta name="viewport" content="width=device-width, initial-scale=1".

Which HTML element is for self-contained content like articles

• article.

Which is a semantic HTML element used for site navigation

• nav.

Which CSS shorthand sets top, right, bottom, left margins

• margin.

Which JavaScript function delays code execution by a specified time

• setTimeout().

Which function repeats execution at a set interval

• setInterval().

How do you stop an interval set by setInterval

• clearInterval(intervalId).

Which attribute makes an input not editable

• readonly.

Which attribute disables an input and prevents interaction

• disabled.

Which CSS property controls how content overflows an element

• overflow.

Which method replaces an element's HTML content securely as text

• textContent.

Which property returns or sets the HTML inside an element

• innerHTML.

Which JavaScript concept allows functions to access variables from their outer scope

• Closure.

Which operator is used to create a template literal in JavaScript

• Backticks.

Which CSS property flips or moves an element in 2D/3D space

• transform.

Which method adds HTML before an element's first child

• parent.insertBefore(newNode, parent.firstChild).

Which property sets how text wraps inside an element

• white-space.

Which JavaScript keyword creates a promise explicitly

• new Promise().

Which CSS property creates rounded corners on elements

• border-radius.

Which attribute tells the browser where to find the favicon

• link rel="icon" href="favicon.ico".

Which method prevents a form from submitting and allows custom handling

• event.preventDefault().

Which CSS property controls element opacity

• opacity.

Which HTML element is used for emphasized text

• em.

Which HTML element indicates important text

• strong.

Which JavaScript method copies a portion of an array to a new array without modifying the original

• slice().

Which method changes an array by removing or replacing existing elements

• splice().

Which CSS rule targets elements with attribute type="text"

• input[type="text"].

Which HTML element is used to provide a caption for a table

• caption.

Which CSS property defines the font weight

• font-weight.

Which attribute specifies an element's role for accessibility

• role.

Which API allows storing key-value pairs in the browser persistently

• localStorage.

Which API stores data only for the session and clears it on tab close

• sessionStorage.

Which method removes a key from localStorage

• localStorage.removeItem(key).

Which HTML element is intended for side content like a sidebar

• aside.

Which CSS property affects only the first line of an element

• ::first-line pseudo-element.

What is the purpose of semantic HTML

• To convey meaning and structure to browsers and assistive technologies.

Which attribute on script prevents the browser from executing the script immediately when parsing

• defer.

Which CSS property sets the number of columns for multi-column layout

• column-count.

Which CSS function limits a value between a minimum and maximum

• clamp().

Which JavaScript method finds the index of the first element that passes a test

• findIndex().

Which HTML element is used to group form controls and labels

• fieldset.

Which attribute associates a label with a form control

• for.

Which CSS property sets a background image on an element

• background-image.

Which property changes the order of flex items without changing the DOM

• order.

Which HTML element is used to define a block of preformatted text

• pre.

Which CSS property specifies how long an animation takes to complete one cycle

• animation-duration.

Which JavaScript method merges two or more arrays into a new array

• concat().

Which CSS property allows smooth scrolling behavior for in-page links

• scroll-behavior.

Which HTML attribute indicates the language of the document

• lang.

Which CSS rule applies styles to screens narrower than 600px

• @media (max-width: 600px).

Which JavaScript property returns the length of an array

• array.length.

Which HTML attribute specifies an input's placeholder text

• placeholder.

Which CSS property sets element positioning context for absolute children

• position: relative.

Which position value fixes an element relative to the viewport

• fixed.

Which CSS property creates spacing between flex items

• gap.

Which HTML element is used to embed audio

• audio.

Which attribute allows cross-origin requests in script or link elements

• crossorigin.

Which JavaScript property returns the viewport width

• window.innerWidth.

Which CSS property sets whether an element floats to the left or right

• float.

Which HTML element is used to define a generic inline container for phrasing content

• span.

Which HTML element is used to create a clickable button

• button.

Which CSS property sets the transition timing function (e.g., ease, linear)

• transition-timing-function.

Which JavaScript method clones a node and its subtree

• node.cloneNode(true).

Which attribute on img enables lazy loading in supporting browsers

• loading="lazy".

Which CSS property enables text truncation with an ellipsis

• text-overflow: ellipsis.

Which HTML element is used to embed external content like an iframe

• iframe.