Here we can see a piece of CSS code where we use class selectors - .selectors-table - as well as "nesting" slectors - all th elements inside element with class="selectrs-table". They are combined all together using comma so that the same styles can be applied to elements that satisfy at least one of the given selectors.

Here is a CSS selector that allows us to style all input elements with type="text" - which is an attribute of input HTML element - as well as elements with tags select, textarea.