The span tag has a class attribute whose value is the four CSS classes defined in the previous step. HTML allows you to add multiple classes to a tag. This span tag contains the letter "t." ...

What's the CSS Class Field? The CSS Class Field allows authors to apply a style that is predefined in one or more stylesheets associated with the site or page. It can be found when an author double ...

Then press F12 (or right-mouse click and select Go To Definition) and, voila, you're in the right style sheet with your CSS class rule selected. It also works with the CssClass attribute: ...

This code creates a CSS class named stretchX. The width parameter's value, 400px, tells browsers to make any element that references the class 400 pixels wide.