Version Details and Security Vulnerabilities

These two versions of the autoprefixer npm package, 0.4.20130515 and 0.4.20130507, offer developers a way to automatically add vendor prefixes to their CSS, ensuring compatibility across different browsers. Autoprefixer leverages the "Can I Use" database to determine which prefixes are necessary for specific CSS properties and values, simplifying the often tedious task of manual prefixing. Both versions, released in May 2013, share the same author, license (LGPL 3), repository, and core dependencies, relying on the rework CSS parser.

While the core functionality remains consistent, the key differentiator lies in the release date and potentially the underlying "Can I Use" database snapshot. Version 0.4.20130515 was published on May 15, 2013, a week after 0.4.20130507 which came out on May 7, 2013. This suggests that the later version likely includes updated browser compatibility data, reflecting changes in browser support for CSS features during that period. Developers choosing between these specific versions should opt for 0.4.20130515 to benefit from the most up-to-date prefixing rules available at the time. Both package versions use the same dev dependencies intended for testing and code styling like mocha, sinon, should, component, js-beautify and coffee-script, indicating a commitment on code quality and maintenance. This provides a degree of confidence for developers integrating autoprefixer into their build processes.