Selenium IDE 3.x:Javascript 表达式在什么情况下被评估?

Selenium IDE 3.x: In what context are Javascript expressions evaluated?

是否有关于在 Selenium IDE 3.x 中评估 JavaScript 表达式的上下文的文档? official documentation只提到Javascript表达式可以在几个命令中使用,但没有说明这些表达式可以包含什么。

https://www.seleniumhq.org/selenium-ide/docs/en/api/commands/#execute-script

Executes a snippet of JavaScript in the context of the currently selected frame or window. The script fragment will be executed as the body of an anonymous function.