The missing content

This is definitely a well structured and friendly project, however, contents like "web worker", "canvas api", "message channel", etc are missing (or i missed). Is there a plan for additional articles in order to make this project even better ?
if so, I'd like to contribute to "web worker"(or other) section.

先檢視現有的教學內容，以及 issue 提出的主題：web workers、Canvas API 和 message channels。範圍和目標文章尚未決定；要視為完成，必須先就主題達成共識，並完成一篇整合到教學中的文章。

由索引模型根據 Issue 內容生成。