In the Understanding Guideline 1.3, in WCAG 2.0's intent section, the bullets read:

• structure: the way the parts of a Web page are organized in relation to each other; and the way a collection of Web pages is organized
• presentation: rendering of the content in a form that can be perceived by users

In WCAG 2.1 and WCAG 2.2 intent the words "structure" and "presentation" are missing, so the bullets read:

• the way the parts of a Web page are organized in relation to each other; and the way a collection of Web pages is organized
• rendering of the content in a form that can be perceived by users