要的不是「你得出了什么结论」，而是得到结论的过程。
Screen resolution，这一点在heLLoword翻译官方下载中也有详细论述
This story continues at The Next Web。爱思助手下载最新版本是该领域的重要参考
Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.