JavaScript Can Change HTML Content Mocktest

The element.replaceWith() method in JavaScript is used to replace one HTML element with another in the DOM. This method replaces the specified element (element) with the new element provided as an argument, effectively swapping the old element with the new one in the document structure.

The setAttribute() method in JavaScript is used to set or change the value of an attribute on an HTML element. This method allows you to dynamically modify attributes such as class, id, src, href, style, etc., based on application logic or user interactions.

To hide an HTML element from the user interface using JavaScript, you can use the element.style.display property and set it to "none". This style modification hides the specified element, removing it from the document flow and making it invisible to the user.

The click event in JavaScript is triggered when a user clicks on an HTML element. This event is commonly used to handle user interactions such as button clicks, link clicks, or any element that can be interacted with by clicking.

To add a CSS class to an HTML element using JavaScript, you can use the element.classList.add("className") method. This method adds the specified CSS class ("className") to the element, allowing you to dynamically apply styles or behavior defined in the CSS class to the element in the document.

The removeChild() method in JavaScript is used to remove a specified child node from an existing element in the DOM. This method removes the specified child node from the parent element, effectively detaching it from the document structure.

To dynamically change the text content of an HTML element based on user input using JavaScript, you can use event listeners like addEventListener to detect input changes (e.g., typing in an input field) and update the element's text content accordingly. This approach ensures real-time updates based on user interactions.

The innerHTML property in JavaScript is used to set or retrieve the HTML content of an element, including its descendants. Unlike textContent and innerText, which deal with plain text, innerHTML allows you to manipulate the HTML structure within an element, making it suitable for tasks involving complex HTML content or dynamic HTML generation.

To dynamically change the background color of an HTML element based on user actions using JavaScript, you can use event listeners like addEventListener to detect user actions (e.g., mouse clicks, keyboard inputs) and update the element's background color accordingly. This approach ensures interactive and responsive behavior based on user interactions.

To dynamically change the CSS style of an HTML element using JavaScript, you can use the style property of the element to directly modify CSS styles. For example, element.style.backgroundColor = "red"; sets the background color of the element to red dynamically. This approach allows for inline style modifications directly from JavaScript.