从外部脚本生成的元素中删除DOM元素

Within a page, I have third-party ad content that is generated by an external script. This content takes a little while to load. I would like to remove a line break from the ad content - to do so, it's necessary to wait until the external script has loaded and all of the functions called within that script have stopped running. I was tinkering with the following idea, but I guess it only waits until the external script is loaded:Within a page, I have third-party ad content th