Learn how to use CSS pseudo-elements to style content that does not actually exist in your HTML, like ::before and ::after ...

CSS selectors can be HTML tags, class attributes assigned to HTML tags and even states of a given element, such as the disabled state of an input field or the hover state of an anchor link. Making it ...

It would be possible to create a CSS rule that will apply to any HTML element called "introduction". For example: The # symbol is used in CSS to let the browser know that the selector will apply a ...