How to insert a script in Drupal into a page?

Question

Drupal

Hello! I am new to Drupal. the essence is that it is necessary to make a drop-down text in the article. I found an example of how to do it, but there with a script and when I insert chrome into the page, for example, it swears and does not open the page at all. It blocks in general. please tell me how to insert the script. I immediately say that I googled it, but somehow very few people explained it properly.