1. Rendering: Fabric.js is a powerful JavaScript framework that allows developers to create and manipulate complex 2D graphics on the HTML5 canvas. It provides a high-level API for rendering graphics, allowing for easy manipulation and interaction with objects. On the other hand, WebGL is a low-level graphics API that allows for rendering 2D and 3D graphics on the web. It provides direct access to the GPU, allowing for more advanced and efficient rendering compared to Fabric.js.

2. Performance: Due to its low-level nature, WebGL offers better performance compared to Fabric.js. Since WebGL directly interacts with the GPU, it can take advantage of hardware acceleration, resulting in faster rendering and smoother animations. Fabric.js, on the other hand, relies on JavaScript for rendering, which can cause performance bottlenecks, especially when dealing with complex or large-scale graphics.

3. Supported Features: Fabric.js provides a rich set of features and functionalities specifically designed for 2D graphics. It offers built-in support for various object types, including shapes, images, and text, along with advanced features like object grouping, image filtering, and text effects. WebGL, on the other hand, is a more generic graphics API that can handle both 2D and 3D rendering. While it provides more flexibility, it may require additional effort and coding to implement specific 2D functionalities that come out-of-the-box in Fabric.js.

4. Cross-browser Compatibility: Fabric.js is designed to work smoothly on all major web browsers, including Chrome, Firefox, Safari, and Internet Explorer. It handles browser-specific quirks and inconsistencies, ensuring consistent rendering and behavior across different platforms. WebGL, on the other hand, relies on the browser's support for the WebGL API. While the support for WebGL has significantly improved over the years, there can still be some variations in terms of performance and compatibility between different browsers.

5. Ease of Use: Fabric.js provides a user-friendly and intuitive API that makes it easy for developers to create and manipulate graphics on the canvas. It abstracts away much of the complex low-level WebGL code, allowing developers to focus on the main logic of their application. WebGL, on the other hand, requires a deeper understanding of computer graphics concepts and a more hands-on approach to coding. It offers more control and flexibility but may have a steeper learning curve for developers who are not familiar with the underlying graphics pipeline.

6. Community and Documentation: Fabric.js has a large and active community of developers, which translates to a wealth of resources, tutorials, and support available online. It has well-maintained documentation that covers various aspects of the framework, making it easier for developers to get started and find solutions to their problems. WebGL, being a lower-level API, has a more specialized and smaller community. While there is still documentation and resources available, they may be more limited in comparison.

In Summary, Fabric.js is a high-level JavaScript framework for 2D graphics rendering on the web, offering ease of use, extensive features, and broad browser compatibility. WebGL, on the other hand, provides low-level access to the GPU, enabling better performance, more flexibility, and wider application possibilities at the cost of a steeper learning curve and potentially more complex coding.