Catalyst Components vs github-elements

Set of patterns and techniques for developing components; Provides a small library of functions to make developing Web Components easier

Input element that validates its value with a server endpoint; Auto-complete input values from server search results; Copy element text content or input values to the clipboard; A modal dialog that's opened with <details>; A menu opened with <details>; Attach files via drag and drop or file input; Display elements in a subtree that match filter input text; Backports native emoji characters to browsers that don't support them by replacing the characters with fallback images; A custom element for cropping a square image. Returns x, y, width, and height; A client-side includes tag; Markdown formatting buttons for text inputs; An input element that sends its value to a server endpoint and renders the response body; An accessible tab container element with keyboard support; Drag and drop task list items; Activates a suggestion menu to expand text snippets as you type; Web component extensions to the standard <time> element; A custom element that shows text as if it were being typed