Bootstrap 4 Quick Start: Quiz

The Bootstrap grid system is based on 12 columns. This means that the layout of a webpage can be divided into 12 equal-width columns, allowing for flexible and responsive designs. By using a combination of these columns, developers can create a grid layout that adjusts to different screen sizes and devices. The 12-column grid system is a key feature of Bootstrap and helps in creating visually appealing and functional websites.

Responsive design is indeed a big challenge because it requires finding a balance between the content needs for both mobile and desktop. Desktop sites typically have more space to accommodate elements like carousels, videos, parallax background images, and text blocks. Therefore, the statement "True" is correct.

The correct class name to make a full width container in Bootstrap is ".container-fluid". This class is specifically designed to create a container that spans the full width of the viewport, allowing the content to expand and fill the entire width of the screen. The other options provided, such as ".container-full", ".container-width", and ".container-fw", are not valid class names in Bootstrap and would not achieve the desired full width effect.

Cards in Bootstrap 3 are used to replace panels, thumbnails, and wells. They are essentially a contained group of content with a border and inner padding. This statement is true as it accurately describes the purpose and functionality of cards in Bootstrap 3.

A mobile first approach prioritizes the needs and objectives of mobile users by delivering content that is specifically designed to help them accomplish their goals. This approach eliminates unnecessary and irrelevant content, ensuring that the information presented is concise and relevant. Additionally, a mobile first approach focuses on optimizing the loading speed and usability of the content, providing a seamless and efficient user experience. Therefore, the statement "True" accurately reflects the concept of a mobile first approach.

IDs and classes are both used in HTML and CSS to select and style elements, but they have some key differences. IDs are unique and should only be used once per page, while classes can be used multiple times. Additionally, an element can have multiple classes, but it should only have one ID. This allows for more specific targeting and styling with IDs, while classes are more flexible and can be used for multiple elements. Therefore, the correct answer is that IDs should be used only once per page, while classes can be used multiple times.

To have 3 equal columns in Bootstrap, the class that should be used is ".col-md-4". This class will divide the available space into 12 equal parts and allocate 4 parts to each column, ensuring that all three columns have equal width and are displayed side by side.

The correct answer is CRC = .container > .row > .col. In the Bootstrap grid system, the container class is used to contain the entire grid layout. Inside the container, rows are created using the row class. And within each row, columns are defined using the col class. So, the proper order of elements in the Bootstrap grid is container > row > col.

The spacing utility classes in the given code will result in 0 padding on all breakpoints. However, the class "p-md-4" will add a padding value of 4 on the md breakpoint. The class "p-lg-0" will then override the padding value on the lg and xl breakpoints, effectively stopping the padding from being applied on those breakpoints.

The class name that would replace the asterisks in the code block is "card". This is because all the class names in the code block have a common pattern where they start with the word "card" followed by a specific description (e.g., "card-img-top", "card-block", "card-title", "card-text"). Therefore, it can be inferred that the missing class name should also follow this pattern.

In Bootstrap 4, 1rem is equal to 16px. The "rem" unit in CSS stands for "root em" and it is based on the font-size of the root element of the document, usually the element. By default, the font-size of the root element is set to 16px in Bootstrap 4, so 1rem is equivalent to 16px.

Class name prefixing in Bootstrap helps to scope styles to only the relevant elements, making the code more durable and easier to maintain. These elements or group of elements are commonly referred to as "components".

Bootstrap 3 should be used if you need to support IE9. This version of Bootstrap is compatible with IE9 and provides the necessary CSS and JavaScript components to ensure proper functionality in this browser. Bootstrap 2 may also work, but Bootstrap 3 is specifically recommended for IE9 support. Bootstrap 4, on the other hand, dropped support for IE9, so it should not be used if compatibility with IE9 is required.

The correct class name to add to the image tag in order to make it responsive is ".img-fluid". This class is commonly used in Bootstrap framework to make images scale properly and maintain their aspect ratio as the screen size changes.

The meta tag with the "viewport" attribute and its content "width=device-width, initial-scale=1" prevents browsers from scaling desktop websites on mobile. This means that the website will be displayed at the same size on mobile devices as it would be on a desktop, without any automatic scaling or zooming applied by the browser.

Flexbox is actually a core CSS technology and not just a custom named component created by Bootstrap. Flexbox is a layout model in CSS that allows for the creation of flexible and responsive layouts. It is supported by all major browsers and is widely used in modern web development.

Setting a grid tier of .col-sm-6 means that the div will be 6 columns wide on the sm breakpoint and everything above it. This means that on the sm breakpoint and any larger breakpoints, the div will take up 6 columns of the grid system.

In Bootstrap, content must be placed within columns. Columns are used to create a grid system that allows for responsive layouts. By placing content within columns, it can be easily organized and adjusted to fit different screen sizes. This helps to ensure that the content is displayed properly and optimally on various devices.

You can add Bootstrap to your website by either linking to a precompiled CSS/JS version via CDN or locally, or by linking to a customized build using the Sass source files. These are the two main ways to incorporate Bootstrap into your website.