[GENERAL] Modern CSS Scroll Positioning and Visibility Specifications

These sources collectively define the technical standards for how web browsers handle scrolling and element visibility. The documentation details the CSSOM View Module's specific algorithm for the scrollIntoView() method, explaining how alignment and scrolling behavior are determined programmatically. It also introduces CSS properties like scroll-padding and scroll-margin, which allow developers to create "optimal viewing regions" so that content is not obscured by fixed headers or the viewport's edge. Furthermore, the text covers the CSS Overflow Module's rules for smooth scrolling and the Scroll Snap Module, which ensures elements lock into place at specific points. Finally, the Box Alignment Module is discussed to distinguish between safe and unsafe alignment, preventing content from overflowing into unscrollable areas. Together, these specifications provide a comprehensive framework for controlling how users navigate and view content within scrollable containers.