The declaration block does not contain one or more declarations separated by semicolons.

Each declaration includes a CSS property name and a value, separated by a colon.

Multiple CSS declarations cannot be separated with semicolons, and declaration blocks are not surrounded by curly braces.

CSS selectors are used to "find" (or select) the HTML elements you want to style.

Which is not a method for inserting CSS into a webpage?

An inline style may be used to apply a unique style for a single element.

CSS comments are not displayed in the browser, but they can help document your source code.