style-observer: Observe CSS property changes

StyleObserver is a JavaScript library that detects changes to CSS properties on elements within a document. It provides a reliable way to observe modifications to both custom properties and standard CSS properties (excluding transition and animation). The library leverages the MutationObserver API to efficiently monitor these changes and notify registered callbacks, offering a solution to address browser inconsistencies and dynamic styling scenarios.

StyleObserver is lightweight and utilizes only ESM code with no external dependencies. It offers comprehensive testing with over 200 unit tests. It includes throttling per element to prevent excessive callbacks and avoids overwriting existing CSS transitions. The library is designed for robustness and compatibility across major browsers.

• Custom Properties: Accurately observes changes to CSS custom properties.
• Standard Properties: Detects modifications to standard CSS properties (excluding transition and animation).
• Shadow DOM Support: Observes changes on elements within Shadow DOM.
• Lightweight Design: ESM-only code with no external dependencies for minimal overhead.
• Extensive Testing: Includes over 200 unit tests for reliable functionality.
• Throttling: Limits the frequency of callback invocations per element.
• Transition Preservation: Does not overwrite existing CSS transitions.

StyleObserver is an actively maintained project with a strong focus on compatibility and robustness. It features a consistent release history, a growing number of contributors, and a responsive community. The detailed documentation and comprehensive test suite further indicate a stable and reliable library.

StyleObserver benefits developers who need precise control over CSS styling in dynamic web applications. It is ideal for addressing browser inconsistencies, implementing advanced animations, and building applications with adaptable user interfaces. By providing a dependable mechanism for detecting CSS property changes, StyleObserver simplifies the development process and improves the overall reliability of web projects.