Provides utility functions to get and wait for elements asyncronously that are not yet loaded or available on the page.
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/488161/1335321/wait-for-element.js
Provides utility functions to query elements asyncronously that are not yet loaded or available on the page.
Available functions are waitForElement, waitForElementByParent, waitForElementOptions, which are all documented in the userscript JSDoc.
This will require make-mutation-observer as dependency. Make sure to @require'd it before requiring this library.
