I need to know how to use classes and containers. Specifically this part, which I do not know where to put or what the "id_of_container" should be: ...

Google removed outdated JavaScript and accessibility guidance from its documentation. Google Search has rendered JavaScript well for years. It's the latest in a series of JS documentation updates.

Google reported on their Webmaster Central Blog today that they will be launching a new tool in the next few days to help users better understand how Google renders their JavaScript-coded website.