PDF.js ES5 Distribution

pdfjs-dist-es5 is a pre-built, ES5-compatible distribution of Mozilla's PDF.js library, designed for environments that lack support for modern JavaScript features like `async`/`await`, optional chaining, or private class fields. It aims to provide a general-purpose, web standards-based platform for parsing and rendering PDF documents directly in the browser using HTML5. The current stable version is 2.13.216, though the main `pdfjs-dist` package has much more recent releases. This package serves as a specific compatibility layer rather than the bleeding edge, focusing on broader browser support. It differentiates itself by offering a transpiled version of the core PDF.js engine, making it suitable for legacy applications or older browser targets that cannot handle the ES2015+ syntax of the primary `pdfjs-dist` package. Its release cadence is tied to specific compatibility needs, making it less frequent than the main library.