Small tab on Chrome browser using JS

I just wanted to ask about the image below. I'm currently building a Chrome extension that opens the LinkedIn tab in a "small tab" style like the image below. I can't find any reference to this on other sites. Can anyone tell me how to achieve this using either Chrome APIs or JavaScript? I really need to learn how to achieve this.

Thanks in advance for the upcoming answers!

You can do that using the chrome.tabs API.
Specifically, the chrome.tabs.create(..) function.

If you take a look at the documentation, the create function accepts as the first parameter the new tab's properties, the propriety that you're interested in is pinned.

That means that in order to get the desired effect, you need to use something like this:

chrome.tabs.create({ url: 'https://linkedin.com', pinned: true });