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We can give our elements unique id or class attributes so we are able to specifically target and style them in our CSS code, which we will talk more about later when we learn HTML and CSS.

For instance, if a class defines a width of 100 pixels, all DIVS referencing that class will be 100 pixels wide. You can override a DIV's CSS class definition by updating the DIV's HTML code.

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: ...

Output: The results of executing the CSS, HTML, and JavaScript entered into the sections of the page. Figure A shows jsFiddle loaded in Internet Explorer 9 with empty code panes.