HTML and CSS Certification Practice Test

Styling a single element within a group of elements can effectively be accomplished by using the element's ID selector. The ID selector in CSS is defined by placing a hash symbol (#) before the ID name and is unique to a single element within the HTML document. This allows you to target and apply specific styles to just that one element, without affecting other elements.

For instance, if you have multiple `<div>` elements but want to style only one of them, assigning an ID like `<div id="uniqueElement">` allows you to write CSS that specifically targets that ID with a rule like `#uniqueElement { color: blue; }`. This will change the text color of only the element with that specific ID to blue, showcasing the precise targeting capability of the ID selector.

Other methods, such as class selectors, universal selectors, or descendant selectors, either apply styles to multiple elements or are not specific enough for individual targeting. While class selectors can also be used to style elements, they are intended for multiple elements sharing the same class, making them less suitable for styling a single element distinctly amidst a group.