This is another technical question which the interviewer is using to determine your qualifications for this job. You can anticipate that most of the questions you will be asked in an interview for a web developer position will be technical. The best way to prepare for this is to read these questions out loud and then answer them using your own language, again out loud. This will help you build muscle memory and will prepare you to answer these questions when asked by the interviewer.
"There are several display property values for each element in a CSS layout. These define how the element will appear on the web page. Values include div, default, p, and section. The default display value for most elements is either block or inline."
"While there are many values which dictate how an element is displayed on a webpage, the default display values are block or inline. Other possible values include div, p, and section. All the HTML tags are displayed and aligned out of the box except for these last elements which are set as block by the browser."