Drawing separator lines in CSS for webpage structure and readability is common.Existing techniques like using borders or pseudo-elements have limitations.Challenges include changing item sizes, special coding for first/last items, etc.Workarounds like grid container's background showing through gaps exist.Introduction of CSS gap decorations proposal aims to streamline separators.The proposal extends column-rule to grid and flexbox layouts.Syntax examples show how row-rule properties can define multiple decorations.Fine-tuning options like *-rule-break and *-rule-outset provide control over decorations.Developer feedback on the CSS gap decorations proposal is encouraged.To provide feedback, developers can refer to the explainer and GitHub repo.