DOMRect - Web APIs | MDN
A DOMRect describes the size and position of a rectangle.| MDN Web Docs
Baseline identifies the availability of web platform features across popular browsers, including APIs, CSS properties, and JavaScript syntax. Baseline describes web features as being either widely available or newly available. Features that do not meet the Baseline criteria are said to have limited availability.| MDN Web Docs
The Element.getBoundingClientRect() method returns a DOMRect object providing information about the size of an element and its position relative to the viewport.| MDN Web Docs
1. Background| drafts.csswg.org
