What is the default size of h6 element in bootstrap.

What does bootstrap class md mean for.

 Which of the following creates toggleable tabs? 

How to remove a list's bullets and display items in a single line?

A standard navigation tab is created with ?

 What activates the collapsible element with an option? 

Which CSS class is used to easily round the corners of an element only from the bottom?

The ARIA attribute aria-label is used to provide an accessible name to the button in modals or alerts.

Which CSS positioning class allows an element to be positioned relative to its parent container, without depending on its siblings?

Statement 1: Two common video aspect ratios are 4:3 and 16:9.

Statement 2: Image classes can be applied directly to <iframe>, <embed>, <video> and <object> elements.