Web Security Sandbox Using WebAssembly and QuickJS
This paper proposes a WebAssembly‑QuickJS sandbox that isolates JavaScript execution and uses Shadow DOM/iframe for CSS isolation, delivering W3C‑compliant, high‑performance security for web apps, achieving 355× communication gains over mini‑programs while maintaining a lightweight, extensible ecosystem for e‑commerce plugins.
This document presents a technical solution for web security sandboxing using WebAssembly and QuickJS. It addresses limitations of traditional web open technologies like Webview and mini-programs by proposing a new architecture that enhances developer experience and business product experience. The approach involves running JavaScript in a WebAssembly+QuickJS secure container for isolation and controlled execution, while CSS uses Shadow DOM and iframe for style isolation.
The architecture emphasizes W3C standards compliance and aims to build a third-party open technology ecosystem for e-commerce. Technical details include WebAssembly's compilation process (Liftoff to TurboFan optimization) and binding mechanisms between WebAssembly and QuickJS runtime. Performance benchmarks show significant improvements in communication efficiency (355x vs mini-programs) despite reduced JS execution speed (1% of V8).
Current business applications include landing in private domain scenarios like flagship store decoration forms, with positive ISV feedback. Future plans focus on plugin systems, startup time optimization, and QuickJS debugging capabilities.
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