Default size of H2 bootstrap heading 

 How many classes does bootstrap grid system has?
 

 Progress bars are not supported in ______________
 

Which HTML tag is used to wrap the name of the source work in a <blockquote>?

Use the <picture> element to specify multiple <source> elements for a specific <img>.

Which of the following values does the sides parameter in the class format {property}{sides}-{breakpoint}-{size} cannot have?

What is the Bootstrap framework?

How can aspect ratios be added with the embed-responsive class?

What is the meaning of 'gutter width' in web design?

Which of the following CSS utility classes are available for controlling the visibility of elements?