I'm trying to move to CSS only, however I have a couple of stumbling blocks to overcome. First, what's the difference (advantages?) of using CSS id vs CSS class (#content vs .content for instance ...

ID attribute overrides class attribute. In this example I demonstrate how an ID attribute will override a class attribute linked from an external CSS file while applied to a sample <section ...

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In this example, we used jQuery to find the element with the id of test-switch (the Test Button), and when we clicked on the button, jQuery triggered a function to toggle the class ...

The :has pseudo-class. The :has pseudo-class is an interesting addition to the selector aspect of CSS. As of this writing, all the major browsers except Firefox support it, with Firefox allowing ...