What is a user agent stylesheet?

Question

I\'m working on a web page in Google Chrome. It displays correctly with the following styles.

table {
    display: table;
    border-collapse: separate;
             


        

Answer 1

A user agent style sheet is a ”default style sheet” provided by the browser (e.g., Chrome, Firefox, Edge, etc.) in order to present the page in a way that satisfies ”general presentation expectations.” For example, a default style sheet would provide base styles for things like font size, borders, and spacing between elements. It is common to employ a reset style sheet to deal with inconsistencies amongst browsers.

From the specification...

A user agent's default style sheet should present the elements of the document language in ways that satisfy general presentation expectations for the document language. ~ The Cascade.

For more information about user agents in general, see user agent.